The point that things need to be "dumbed down" for casuals also ignores the fact that 5e is the most popular version of the game. It's a system that has already been proven to attract new players and keep them. It doesn't need simplifying to attract folks. It just needs a good tutorial. There are certainly issues that could be brushed up and improved but there's no way Larian is found any of this for the sake of casuals. Respeccing is a pretty standard inclusion in these games and you don't need to do it justbfor min-maxing. Someone might start a game as a rangers thinking they'll really like it, but then ten or more hours in realize they dont like the way it plays. So now they can change to something else and their time isn't wiped out. Simple.
Maybe casual players benefit, but Larian just want people to make stupid builds and do meme stuff. They never needed any of this. Blaming casual players for wanting this is diverting the point. Larian isn't doing anything Larian doesn't want to do.