It looks simmilar to OS because its made by larian.
none of the things youve seen are typical for original sin, they are typical for Fantasy RPGs.
Does Dragon Age also look like Original sin? by your definition it probably does since the BG3 screenshots remind me of dragon age inquisition a lot.

>own visual identiy
such as?
Such as ye olde england?

And yes, by all means, vote with your wallet. All 3 of you.