This idea defeats the purpose of doing any dungeons or raids. No MMO has this. You go into a dungeon (Primals included) and you explore. No matter how many times you wipe, you have 60-90 mins to learn the fight. Even if your stuck on primals, if some people cant get through the first phase while you are eager to get to the second phase, simply find other people that can get to the second phase with you.

Anything that your suggesting is basically cheating in my view.