My personal observation is that it certainly feels very same to the other larian games. Especially noticeable when we do a jump- the dotted curved line, the awkward animation that looks like someone winding up for a jump by crouching down and then launching themselves- just yuck.
The game feels like a baldurs gate skin has been applied to an original sin "way of doing things". Its like when the same movie director makes several movies, you can see same elements starting to show through.
I think its a cost cutting and efficiency measure, in that they already have systems in place to control various aspects, and they have reused code as much as possible, which is sound software engineering practice but as an end user that is not what I fundamentally want.
It would be nice to have an alternative intermediate "ui-skin" layer so people can decide for themselves what look and feel of menus and movement should look like, but that could also come in as mods further down the line.