Plus I do think there's something to be said for the fact Larian has been claiming this to be ass close to the real tabletop experience as they can make it. If they had just said they're adapting the 5E system it'd be simpler but they've made a promise to customers, and deviating as far as your suggestion would be breaking that promise and there'd probably be repurcusions. And it's unreasonable to expect people who came because they were promised a thing not to get mad when the people who made that promise actively choose to go against it. Larian made the promise and got themselves into the situation. Now it's on them to deal with it.
