Roles for Samurai, Red Mage, Dancer

[aesteval]

People don't tank because it's the most demanding role (except maybe healers) and requires the most attention while playing.

I don't know if tanks require the most attention while playing. While some jobs definitely require less attention than tank, effective support on various roles all require additional attention. Healers, played properly, require quite a bit of attention. BRD, MCH, and SMN should all be paying attention to the entire party's state. Other DPS also have support functions that can be best optimized during certain parts of a fight or at certain times. And all roles should be paying attention and managing aggro and watching for new mobs entering.

That said, I find that I don't like being the pace setter for things and so that's what limits my interest in tanking. I don't like being pseudo "in charge."