The movie is kind of suggesting "See, Ben Affleck just had the sh!t beaten out of him by a martial arts master as a young child and encouraged to fight other children by his father and he turned out fine, he didn't need that sissy facility that actually understands his condition!"
Not really. Ben Affleck killed the mafia people and people bullying the old couple and people trying to kill him all on his own, nobody paid him, and they deserved it. Brax killed innocent people for money.