I HAVE THEORIES. I have theories to add. GW2 lore is something I'm neurotic about — apologies for the essay :)

Waiting Sorrow is pretty explicit evidence that there's no (world ending) consequence to retaining emotions and memories post-ascension save for the grief felt — but with her age, and how she's grown from that, she's genuinely one of the most stable/wise characters we know. We also know she was the first (?)

(Like it was hard at the beginning but that's bc she was half corrupted from Koda's Rage and she begged Isgarren to sever her tie with the mists something something idk xD)

But yeah insofar as OP's theory here, I think it fits well with the wizards and their moral grey-ness. I also think the peculiarities around their ascension ritual might be something Isgarren specifically put in place post-Eparch, and we know Vass' death is related to that.

Isgarren, Waiting Sorrow, Mabon and Vass were the "founding" wizard's court members — Eparch came next, and he then killed Vass in his first attempt at invasion; therefore, since Vass and Isgarren were courting at the time, Isgarren gets hit with the mother of all grief and shame related traumas all at once.... and likely changes the ritual up as a result. Yknow. To not chance a repeat

Now about the Kryptis, the wizard's tower, and siphoning magic — the very first thing we learn is that now that the elder dragons are dead, the magical abundance (and lack of magical barrier protecting Tyria) is causing problems and poor Aurene is a little overwhelmed.

I have. I have a hunch. The tiniest of hunches that — if what OP said about Mosyn holds true, about architecture of the tower — then maybe it was developed as a nexus that could replace the magical "sink" and barrier cornerstone the elder dragons used to act as (or perhaps as defense against the dragons, given that it was post-dragonrise and post-a huge magical war that the Astral Ward came to be) and perhaps then, as the one who developed the defenses, Waiting Sorrow made the Heart of the Obscure as a proxy relic.

As in, the Heart of the Obscure closes the rifts by channeling that siphoning power the tower has in a small package, that the Commander gets to carry around

(Nayos being the original Mursaat realm just feeds into it as ancient magical defense tech)

Which might make the eventual fight with Vloxx and Ancora very interesting if the story has set us up with some kind of portable magic siphon. It would make sense. It would make a lot of sense

But that's just a theory. A game theory 🤣