I think that's not so much a subversion than just another character with another opinion. The trope is alive and well in All Might. It's not anything fresh either. In many shounen stories, there's always that moment when someone stronger, like a teacher or a rival, gives the protagonist (or his friends) a wake up call, saying that their shounen heart isn't enough to save the world.

This episode was good overall. Not being avant-garde isn't a bad thing. It just means... not being avant-garde. Again, that's only up until the latest episode. That may change, and I'm looking forward to that possibility.