Solasta looks like Windows 10 lmao.
Yeah that's it. I think that's what us interface complainers are really talking about at the end of the day. Imagine any game with just an OS interface - you'd have all the functionality you need, but how dull would it feel emotionally? Very dull - because your association with the OS interface is more with utilitarian stuff, for the most part, whereas the game is supposed to entrance you and take you into another world. It just can't do that job with an interface that's too much like a boring OS interface.
Solasta is an excellent example to illustrate the point, as it's in the middle ground.
It's clear that a lot of thought has gone into it in terms of functionality, and it really is
very functional in that sense (which helps make the gameplay flow really slick and trancey); but aesthetically, while I wouldn't go so far as to say that its at the "just a bland OS interface" extreme, it does lack that extra bit of
je ne sais quoi aesthetically.
Funnily enough, you can tell that a little bit of effort has been made, in terms of the tiny bit of florid knotwork in the top right corner of the character portrait. Plus also the item icons are beautifully done and of just the right character (they remind me a lot of Warframe icons in terms of "solid but painterly" feel - though with WF ofc the theme is s-f). So I think the devs are aware of the problem.
But with just a little bit more effort at prettification, as JarlFrank has pointed out, it could be stellar and a classic.
(I suspect the Solasta devs want to leave that sort of thing to modders though - which goes to my first point: if nothing else is moddable about a game, the UI at the very least should be.)