It's not impossible that I update it some more in the future. I do admit that I never really paid much attention to balancing endless mode. I always treated the regular story mode as the main way to play the game.
The story mode is really great and I've had a very fun time unlocking everything, but it's nice to play with the multiple transformations for more than a single round and to see how far a character can be taken. Endless mode gives something new and aspirational to do after the main story is complete.