I mean in versatility. Ryuji, Yusuke, and Makoto all have party buffs to offer when attacking isn't a viable option. Haru has options like the karn skills, or status effect clearing. Morgana only really has healing or wind damage against bosses, but his healing is good enough that it's justified. Ann only really has straight magic damage, worse healing than anyone else offers, or Dekaja. I just don't see the point in using her. I finished at about level 75 on hard mode and I only used her once after getting Makoto. Even if her damage is astronomically high, she doesn't have a lot of other options outside of damage. If you managed to make her work, then good on you; but from my and others' experience it just isn't worth it to use her.