One has to admit though none of the designs changes and balancing decisions are that huge that they couldn't be easily changed back to 5e. I think Larian should trust 5e balancing a lot more and only address things that have well known issues there (rangers) and things that absolutely can't be transfered properly.
I understand that they are worried that you won't be able to do more than 'move and attack' with many classes at the beginning and thus many non-D&D-players would complain, but that is part of the ('questionable'

) charm of 5e. Action economy has to be closer to 5e as its such a key aspect of the game design that changing it can damage balancing too much (as we see).
Biggest issue to revert back to 5e is going to be jumping distance as the environment design is based on that. Still jumping has to be nerved for combat. Its annoying how much jumping is in there.