Can you argue that game is missing a nostalgic feel because it doesn't adhere to 5e rules or previous BG games as you'd like? yes.
Can you discuss balance issues? Definitely, it's early access and of course the game won't be perfect right away
Are other players allowed to like the changes? yes
Did Larian lie? not really, even in OP's links, they never said it'd be 1 to 1 conversion. In fact they said that'd be impossible. They'd get it close as they could. Expect more changes for better or worse as the EA goes on