It does feel like there were a lot of fairly drastic changes made at the last minute. I don't really mind a lot of this stuff, like I've never used a crossbow even in 5e and the sorts but I can see how some of this stuff might be annoying to some degree. But in general I feel like Larian wanted to take some of the difficulty edge off the 5e rules because D&D is a brutally difficult game that largely works because D&D is largely played at a table with other people who can help you out if you make a catastrophically inept character and will all plan what a balanced party should look like with a healer, a tank, etc. But BG3 will be played by a lot of people who have no idea about D&D and most of those will play single player. But all in all I feel like they struck a good balance at making the game approachable while still remaining largely D&D.