They should diverge even farther from the 5E rules. Just about little annoyance I have with this game stems from the 5E ruleset and the things where I've thought, "oh that's a cool thing" have been divergences from it.
Put another way, I'm not looking for a faithful adaptation of a tabletop RPG ruleset. I'm looking for an exciting and dynamic party based CRPG. D:OS1+2 show that Larian can deliver on that. The parts of the early access that feel slow or boring or unimaginative have been things that cleave too closely to the tabletop rules. Make a good game first and worry about the tie-in after.
