Let's Talk the Twins and Their End Goals

[Theodric]

It's possible that there might not actually be a lasting solution to the Primal threat. They could simply be an unfortunate consequence of the nature of Hydaelyn itself. Much in the same way as how natural disasters can only be mitigated rather than avoided.

If a permanent solution is found, I doubt it'll be successful until the final story arc is concluded...but hopefully we're far off from that point.

I think it'd be interesting if history were forced to repeat itself. I'm generally not very fond of the idea of a super powerful hero swooping in and saving the day at every turn. I kind of like the idea of the Warrior of Light being effective in the present but having need of laying the groundwork for a future Warrior of Light to pick up his torch and continue the fight in a different era.

[MetalSnakeXI1]

According to Zenos, the effect of tempering is essentially your will subjugating the will of another, in a way he tempered SHinryu by having a stronger will, which is very similar to what happened with Phoenix.
Personally I think they are trying to tell us something. They have shown us that primals can absorb echo blessed soul orbs and ascians souls.
Then they've shown us that primals can be tempered by the use of the resonance which is essentially a copy of an echo, with Zenos giving us a possible explenation to it.
It's possible that they are telling us they way to seal having ascians without reliying to hard contriviancies like the sword of light, which've seen to be very hard to conjure.

Otherwise I don't get why repeating this plot points.
Granted the reason of why summoning got widespread was because of ascians and would be extremely Ironic if their gift would be their ultimate end.

One thing for sure, it's about time that the story tackles the primal problem seriously.
So far we've been medication at best, we need to find a cure

Well....Lahabrea literally died to a primal xD.So the irony is already there.

Tho the reason that happened is because Thordan had the second eye of nidhogg.

The primal problem ain't easy to solve cuz if we go by the Garlean method of genociding the beast tribes that only makes the primals stronger every time they pray to them for protection.Not to mention pacifist primals like Ramuh he could be summoned at any time the moment the sylphs sense the slightest bit of danger to their existence,or moogle fantasies like Good King Moogle Mog XII.Or primals formed from legends and folklore like Shiva and the Knights of the Round and those can be called forth by any of the living human races in Hydaelyn

By this point I don't think it's possible to eradicate all instances of primal summoning unless another Dalamud-esque size calamity happens that makes all beast tribes go extinct.

[Remedi]

I'm not so convinced it was just because the eye that he was able kill lahabrea, Leviathan didn't had anything to simply eat the soul of an allegedly echo ascended being

[LineageRazor]

Ending the Primal threat pretty much goes hand-in-hand with ending the Ascians. Remember that they are the ones who spread knowledge about how to summon them, and it's their machinations that have the Beast Tribes on edge. With the Ascians gone and the Garleans pacified, it will be easier to maintain no-summon treaties with the Beast Tribes. Once that's done, wait a few generations and knowledge of how to summon will fade due to disuse. From that point on, the only summons that will happen will be ACCIDENTAL summons, such as what happened with Susano.

At least, assuming all this peace and happiness isn't the key to triggering a Flood of Light. *eyeroll*

[Remedi]

Not really, the ascians spread an established knowledge, the primals are not their creation, some summoning have happened by accident in the past, when a certain tribe felt threatened as such ending the ascians will not remove the primal problem completely.
Ending the Garlean campaign will help, but if you consider the summoning of Susanoo it's not a certain thing.
With the right condition any small territorial squabble might lead to a summoning.

[LineageRazor]

Not really, the ascians spread an established knowledge, the primals are not their creation, some summoning have happened by accident in the past, when a certain tribe felt threatened as such ending the ascians will not remove the primal problem completely.
Ending the Garlean campaign will help, but if you consider the summoning of Susanoo it's not a certain thing.
With the right condition any small territorial squabble might lead to a summoning.

I mentioned myself that there would still be accidental summonings. However, the story line points toward this "established knowledge" as having been developed by the Ascians themselves. They may have used accidental summonings as a model, but they're the ones who perfected how to summon deliberately, and are the ones most eager to keep this knowledge well-known.

With the Ascians gone or pacified, the Primal threat would be DRASTICALLY reduced. Accidents will still happen - and it's likely that there will be lingering texts and tomes that have recorded the summoning process that ambitious fools will dig up from time to time. Still, these isolated incidents should be quite manageable.