Do people complain about Solasta's UI? Why? I think it looks smooth and swish... it's clearly your user interface - it doesn't need to look like some piece of fantasy world setting. I found it to be unobtrusive and inoffensive... functionally, the UI itself never drew my attention, and that's exactly what a good UI SHOULD do.
I have seen plenty complaints about it and people called it to be a mobile-game looking UI, but it is organized and functionality wise it is brilliant. I'll take it without a second thought over what BG3 has personally either way.