I was initially worried that it had a fatal game killing issue, such as that locked door bug in Metroid: Other M and Twilight Princess with that cannon room, but then I find this guy beating the entire game. I no longer became worried.
Reminded me of the issue where you could only fight so much in Persona 3 (FES in my case) where each team member would become exhausted, as well as yourself, if you kept fighting and fighting. If you get to where your too weak to go back to Tartarus you're essentially screwing yourself over in the long run.
While this was less of a problem, for me at least, in Persona 4 I doubt that would kill HN for me that easily.