I know why they removed the multi classing requirement.
They wanted to dumb things down and make it so people didn't have to plan their builds ahead of time AND so they could respec at will.
Sigh, I guess this generation's brains would melt if they had to plan a build that spanned BG1 and 2.
My multiclass build was set already. Making a build is a lot of the fun. Respec was just silly anyway. Rewriting the rules nonsense.
Larian understands NOTHING about D&D.
Prepare yourself because it seems like things are much MUCH worse than that. As far as I can tell from some of the other changes reported about BG3 it appears Larian are aligning BG3 at least partially, with the next edition of D&D which releases next year. And a lot of these seemingly wild rule changes may not have been Larian's idea. I suspect it's Wizards of the Coast trying to dumb D&D down for more mainstream appeal and more casual players. God forbid any thinking or planning might be required...we can't have that.