I'm fine with having access to the more powerful abilities early on. The player really shouldn't be struggling at the beginning of the game while they're still trying to work out how to play the game. If someone figures out how to one-shot enemies in their first few fights, I don't see a problem with that. It's when they keep one-shotting enemies (multiple enemies at once, even) all the way through to the final fight that it's a problem.
