Personally I think it’s mediocre and most of your criticisms are spot on, especially the bit about the terrain and environments abruptly changing. It does feel more like a tech demo. Every different little area of that map should be it’s own map the size of the act one map.

It’s a great representation of homebrew 5e, and Solasta is a great representation of another homebrew slightly closer to core. 5e makes for boring gameplay in video games. It’s streamlined for the tabletop. You don’t need to streamline rules for a video game, 2nd edition, 3.5, even 4 would operate well in a video game because all the minutiae is processed instantaneously by the program.

I can’t agree with that. There is a lot of attention to detail and the animations are fluid and high frame. Texture resolution is also high. The art style is also true to D&D.
I have not played in 4k resolution yet, because I’m stuck down in Croatia because there’s no way to get back to Germany because of COVID19 and cancelled trains.