A changed ruleset might be fun but while the DnD 5e ruleset is balanced the stuff Larian is throwing at us is not. And with every deviation they have to balance more, time they could use better to improve the game at other points (e.g. story). And by the way there are already enough threads about DnD vs Larian rules so if you have something useful to contribute do it there. If you read these threads you will also see that there are a lot less fundamentalists than you think and many DnD folllowers have valid reasons to question Larians approach.