It was established when we first fought Ifrit, that there is no cure for Tempering, only death will stop someone tempered from trying to keep resummoning their Primal.
But at the end of the Lakshmi trial, it's said that we've released her thrall on her Vira by destroying her.
Has the lore behind Tempering changed? Do not all Primals temper permanently?
If so, was killing everyone who was tempered by Ifrit a huge mistake? If so, that seems like something that should be mentioned...