that asthmatic engine they’ve been dragging since Morrowind
I don’t believe that’s true at all, though. At least by Wikipedia, Morrowind was NetImmerse, Oblivion was Gamebryo (modified Havok), and Skyrim was Creation. And I remember in the announcements for Skyrim that they remade the engine for the game. And Starfield is an updated engine, Creation 2
Gamebryo was called netimmerse until 2003. Creation is a modified gamebryo. So Creation 2 will also be based on it. So yes they use kinda the same engine since morrowind. Beteshda will not change away from it because gamebryo is a large reason why the modding community is as strong as it is for skyrim etc. And the modding community sells a lot of copies!