What purpose did the isle Azys La serve? Main Storyline Spoiler.

[Delily]

I think you are mistaking the implication and the point of the story. Technology and knowledge itself is not evil. It's a tool. How you use it is how it is defined. There is nothing wrong with rediscovering what Allag achieved. The point the game has made so far was not that "tech is bad, but do it anyway," but "This is what we built, but we lost sight of what was important. Instead of tech supplementing our lives, we grew dependent. Instead of living on this planet, we attempted domininance. Continue to grow, to learn what we learned, to achieve what we achieved, but now know how we failed so you can spare yourself our fate and surpass us one day."

Binding primals to use as an aetheric source of energy constitutes as a Really Bad Idea. Not only do you make them upset in the event they are freed, they represent a constant drain on Hydalyen.
Making pacts with a voidsent is also a Really Bad Idea. Allag was also involved in bioengineering. If anything, the lessons to be learned are to avoid doing what the empire did.

[Echofalls]

"This is what we built, but we lost sight of what was important. Instead of tech supplementing our lives, we grew dependent. Instead of living on this planet, we attempted domininance. Continue to grow, to learn what we learned, to achieve what we achieved, but now know how we failed so you can spare yourself our fate and surpass us one day."

Perhaps, but it seems to me that either Allag was trying to make a last ditch attempt that something of their history would still be relevant when they were gone. Either that or;
"Here's a great big solar panel! But you're not ready to use it yet, it might blow you all up. Have at it when you understand what you're doing It blew us all up too and we knew what we were doing? Yeah, um... oops?"
It's like they went into a panic when they were worried that there might be a future where Eorzea wouldn't need them any more.... Hmm..

We know that the Empire was tearing itself apart in a civil war during the last few years of its existence. Factions are inevitable, I think.

[RiceisNice]

Binding primals to use as an aetheric source of energy constitutes as a Really Bad Idea. Not only do you make them upset in the event they are freed, they represent a constant drain on Hydalyen.
Making pacts with a voidsent is also a Really Bad Idea. Allag was also involved in bioengineering. If anything, the lessons to be learned are to avoid doing what the empire did.

The Garleans sure don't think so, considering that it's worked for over a thousand years and serves to not only keep the primals in check, but to subdue them without any worry of them simply being resummoned.

[Fenral]

"[...] Continue to grow, to learn what we learned, to achieve what we achieved, but now know how we failed so you can spare yourself our fate and surpass us one day."

I think it went unnecessarily far in the "oh, no, we can't lose the tower" direction to support that interpretation. If they truly thought us capable of surpassing them, one of our companions wouldn't have forced himself into a coma to keep the tower itself from being lost, since there would be no need. Tools can be rebuilt and replaced, but people can't. Whatever the intent, that action itself carries the implication that the tools are more important than the people who use them.

I think back on The Legend of Zelda: The Wind Waker, where the King of Hyrule tells Link and Tetra to found a new kingdom, one that isn't Hyrule, but their own. I get the feeling something like that, with Doga and Unei addressing G'raha, would have been more appropriate to send that particular message.

[Delily]

Perhaps, but t seems to me that either Allag was trying to make a last ditch attempt that something of their history would still be relevant when they were gone. Either that or;
"Here's a great big solar panel! But you're not ready to use it yet, it might blow you all up. Have at it when you understand what you're doing It blew us all up too and we knew what we were doing? Yeah, um... oops?"
It's like they went into a panic when they were worried that there might be a future where Eorzea wouldn't need them any more.... Hmm..

We know that the Empire was tearing itself apart in a civil war during the last few years of its existence. Factions are inevitable, I think.

Xande was experiencing existential nihilism. After being revived by Amon, he concluded nothing he did was significant because he was going to die again. He came to the conclusion all existence is meaningless and activated Dalamud. The goal was to open the voidgate and allow the cloud in.

[Delily]

The Garleans sure don't think so, considering that it's worked for over a thousand years and serves to not only keep the primals in check, but to subdue them without any worry of them simply being resummoned.

When did the Garleans become the model of good? The reality of what primals are, and the implications of their existence, was only recently revealed to us by Hraesvelgr.

[RiceisNice]

When did the Garleans become the model of good? The reality of what primals are, and the implications of their existence, was only recently revealed to us by Hraesvelgr.

Didn't say the solution was a good one, but a working one in their eyes. And even then, Dalamud was working fine until someone decided to bring it down.

[CGMidlander]

Didn't say the solution was a good one, but a working one in their eyes. And even then, Dalamud was working fine until someone decided to bring it down.

Kind of like the concerns about nuclear reactors IRL.
Dangerous stuff can be maintained and kept "safe", but somebody may eventually screw things up.

[Velox]

Binding primals to use as an aetheric source of energy constitutes as a Really Bad Idea. Not only do you make them upset in the event they are freed, they represent a constant drain on Hydalyen.
Making pacts with a voidsent is also a Really Bad Idea. Allag was also involved in bioengineering. If anything, the lessons to be learned are to avoid doing what the empire did.

I've already covered that

Instead of tech supplementing our lives, we grew dependent. Instead of living on this planet, we attempted domininance. Continue to grow, to learn what we learned, to achieve what we achieved, but now know how we failed so you can spare yourself our fate and surpass us one day."

Both those tie into hubris. The technology to bind primals doesn't necessarily have to be used to bind primals. After all, nuclear fission was created to make a bomb, but we turned it into a clean and efficient form of energy. As I said, technology is neutral. It's just a tool, nothing more nothing less. It's HOW you use it.

And the whole incident with the Void was NOT the Allagan Empire, it was a madman's idea. You don't blame the many for the actions of a few.

[RiceisNice]

Kind of like the concerns about nuclear reactors IRL.
Dangerous stuff can be maintained and kept "safe", but somebody may eventually screw things up.

And in the case of Dalamud, non-allagans screwing up allagan stuff.