Changing aspects of 5E is completely understandable if they are hard to translate into a video game. I get that. But as others have said, many of the changes seem to have no reason whatsoever. Turning so many actions into bonus actions take away the identity of certain classes. And giving so many of the spells environmental effects make it feel more like a video game and less like a TTRPG. Why does a firebolt set fire to the cobblestone beneath my feet? Why does small puddles of acid burn through my boots and damage me? Why does a bolt of ice fired at my chest create ice under my feet? Stuff like this, feels like Larian is too fond of DoS mechanics.
Not only that, but certain spells become overpowered (cantrips), while the environmental effects from 5e (Like Cloudkill and Fireball), loose some of their flavor since everything creates environmental effects.
I do like that you can set fire to grease etc, because that is something you would ask your GM if you could do. And Larian did state that they wanted come close to the TTRPG experience. Which is why I am confused when it comes to some changes.