Part 2 because character limits still suck.
Now for Alexandrian Technology...it's made pretty clear you need Electrope, and there is no known source of it at this current time on the Source, aside from--obviously--raiding Everkeep to do so--and doing so comes at great risk because in the current political climate, you'd be engaging not only Alexandria, but their diplomatic ties and proximity to Tural suggest Thavnair could get involved too.
But say despite all that, an attacker succeeds in procuring all the electrope Alexandria has to offer--that's still finite. At the most you'd have one nation, maybe a couple of trading partners, with goodly amounts of electrope. It would still be rationed to a degree, or incredibly expensive due to short supply--remember, even with all the Electrope on its native shard, wars were fought over its alleged scarcity. Even with current Eorzean technology there's a wild imbalance between what each nation has access to and considers commonplace. And I'm not even counting Sharlayan in that mix. That reflects real life, too.
Now, all of these problems could sort themselves out in due time, and you could be right--that in the future, the fantasy from FF14 is gone and we all live in a pseudo cyberpunk reality.
But here's the thing, none of that is going to happen before the twins hit their legal drinking age. And we all know that's never going to happen.