[@Savato]
With Kenpachi it made sense, though. He limited himself because he wanted a decent fight. He weakened himself so his opponents could challenge him, so that his fights would have value again. Based on his character, it's a logical thing, and if someone wished to make this a part of their character then they're free to do so. Darquesse herself often doesn't use her full power, as she spends most of her time just toying with people. It's just unexplained limitlessness that annoys me in particular.