Ooshima,
My fcob static (beaten 13).
2 controller users on PC (I'm one)
1 keyboard ONLY (no mouse) user
1 keyboard and touch pad (laptop) user
4 keyboard and mouse users. Some just use mouse for camera. Some use for movement. Some just for targeting. Huge variety just within kb/mouse.

Your argument is invalid.

This game is extremely well designed to support an amazing variety of interface options. That is one of the underappreciated gold stars of ffxiv. It is extremely flexible in control schemes and they are all completely viable.

There's also a vid of a solo heal sch t13 somewhere on a controller. Even healers can be played at the top level with controller.

Ffxiv has one of the most flexible interface systems of any mmo I've heard of.