Eventually, the Mimic/Rogue archetypes (power duplication/temporary absorption) will become quite tiresome. You don't want a whole bunch of characters who can fly or run really fast, are superstrong and invulnerable, projects energy/ice/fire/electricity/radiation blasts all at the same time. The more god-like a hero becomes, the less human and less interesting he/she gets. I mean, what's stopping him/her from conquering the whole universe?!?