No, I think it's about right, rather it's part of the solution to the armory system, which makes everyone self sufficient.

Instead of making people go into skillsets via restrictions they have made them via battle tactics.

A healer is healing not some super do everything redmage. A blm is retricted to his mp allowance given the job, and tanks and DDs have to consider self preservation rather then trying to out damage another, and expect ample defense.

The MP cost as of now has forced people to actually play their jobs as such the weak definition as it is.

about monster AoEs and ranged..Well since this is new, it's pretty easy to tweak such things. if you want 1 tank and 6 arcs and a conj.....well let's just say WoW has solved that rather easily over time with certain monster AIs.

It's pretty easy to config a monster to make sure your guy in the back is in a world of hurting if he doesn't get flexible.

These days, scenario writers have made sure that the "rear guard" is a sometimes job description