It's not "some quirks", gamebryo completely killed any ambition in Starfield with how utterly ancient and impractical it is. Most issues with Starfield, even some gameplay issues, boil down to the engine or the things they had to do to try and mitigate its shittiness. This led the modding community to pretty much ditch Starfield, despite how moddable the game is.

And sure, modding will suffer, but other games with different engines manage to have modded content too.