Well, making a good game is more important than sticking to the rules. After all, the game will be judged primarily as a game, not p&p (at least it won't matter much).
Sorry but even ignoring P&P rules. HAving a lv cap warlock who adventured into the underdark and escaped an mindflayer spelljammer ship unable to kill an goblin child with the max roll on eldritch blast buffed by agonizing blast is not "making a good game"
Spending hours in trash encounters and resting after each encounter is not a good game
Having a awful one summon limit is not a good game.
Wanna see a good game? Check BG1/2.
They have experience in making DOS2*, which happens to have turn based mechanics. Lets not conflate the two.
DOS2 is nothing compared to D&D. Trying to make 5e more DOS like is what is killing this game.