Someone will almost certainly release a mod after release to tweak the game to be closer to the 5e pure balance. Larian is fairly supportive of modders. Until then just consider it a homebrew maybe?

Someone on reddit already made edits to remove surfaces on casting firebolt,etc.

Larian actually talk to WotC about the balance and changes so it's not just random changes being blindly made by the studio either.

I also don't think Larian are unwilling to budge, they already made several changes between announcement and EA just based on concerns of people who hadn't even played yet. The release of EA was the big starting point on getting informed feedback and historically Larian has listened carefully to feedback.