2.4 - Dreams of Ice

[Alukah]

I don't think we'd end up being able to summon the primals themselves, since, you know, the whole tempering thing, and the trying to destroy them permanently thing, and the massive drain on aether thing... doesn't really tie with the story very well. But you never know, they'll probably find a way to do it.

Well, as long as the story keeps changing...

So far we were explained the process how a primal is resummoned and why they never truly die, we have king mog who is a newly created primal and we have ascians granting mere mortals the power of the echo, if they come up with a way to summon primals through the echo the issue with tempering would be solved.