Rather than respond to any of your eye-bleeding wall of text posts, Imma direct you to this video.<snip>
----
Now, moving on...
I confess, as someone who wasn't big on Berwyn before this switch up, I'm not super jazzed about what they ended up doing myself. Not that it was bad per sé, but I think way too much thought was put into this confusing and annoying dungeon and not enough into making the actual content of Berwyn/Wynne's sex scenes line up in quality or even quantity to the original. A dungeon is a temporary experience, permanent NPCs and their associated sex scenes are usually forever. If you can only focus on one or the other, always choose the latter.
Also the post-dungeon interactions for Berwyn/Wynne are exactly the same as Matiha's apart from individual sex scenes. I don't want to accuse anyone of anything but I don't think much of it.
Also also, apparently there were plans for a pussied Berwyn/Wynne to be impregnable and I'm disappointed they're not. Minor complaint but still.
Finally, the handling of Matiha herself seems slightly weighted towards keeping her in the tower and reconciling her with Berwyn/Wynne since otherwise she either disappears or just sits around our keep not really doing anything. I had hoped Matiha's presence there would let us get a discount or even freebie on Wayfort Upgrades from having an in-house wizard but, guess not.
Anyway, I personally place most of the blame for this not on anyone actually involved with this sendoff but the character's original writer, whose departure made this necessary. Maybe that's not fair of me to say, but cause and effect says all of this happened because of the departure.