Wait, I can't control my whole party? Just me? Oh, that does not sound cool.
I can see it now:
ME: Alright, I landed a pretty big hit, now you need to keep at him!
FRIEND uses Magic Razzle Dazzle!
Attack does 0 damage.
ME: WTF was that?!?!?!
ENEMY: Summons something horrible, drains my health to 1.
ME: uses potions on self
FRIEND uses Magic Razzle Dazzle!
Attack does 0 damage.
ME: Are you kidding me?!?! Try doing something useful!
ENEMY: Attacks me from his vibrating Laz-E-Boy because he has freaking tenticles.
FRIEND decides to sacrifice your turn to power up for a bigger attack.
ME: Alright, about freaking time, this better be a good one!
FRIEND use Magic Razzle Dazzle!
Attack does 0 damage.
ME: That's it! I'm killing you myself!
ME teams up with ENEMY!