I can see what Larian is trying to do but it throws off 5e design balance too much. If I were DMing I'd never run these values; my casters would be furious.
Also..it's ok to miss attacks. That's kind of the point of D&D
I quite agree. If our DM would use homebrew rules like BG 3, at least 3 players out of a 5 man group would most likely rage & quit in disgust. Using some homebrew is ok, of course, but not when it throws balance and/or core mechanics out of the window.
Do we really need another topic about the same?
Yes, we do. Because it's already an issue and it will only get more pronounced with more classes, feats, spells and levels.