I find it silly to knock the Scions for not having a solution to Primals considering there's, like, no easy solution to it, lol? That's kind of the whole point! The vaunted wisdom of Allag could only contain them, but time and time again we've seen their containments fail--especially considering the Tempering process can occur with them contained. (And it's going to be impossible to convince someone not to mess with something for all of eternity, so it's gonna happen).

We could look to Varis' solution, but is genocide really something you want to advocate? Not to mention that's going to cause more summonings before it causes less.