You will never find a vertical progression game with no DPS checks. DPS checks are essentially "do you know your job? OK, how is your gear?" They provide the reason to stay locked into the gear treadmill, which is how the game retains subs. Endgame encounters without some form of DPS check will never happen.

Regardless, mechanic only encounters are no more a test of skill than DPS check only encounters. Anyone can play jump rope, and anyone can memorize the first hundred digits of pi and rattle them off. Its when you merge the two that skill comes in.