Considering jobs will prohibit the use of skills from another class.. Materia

[Sephr]

I think that pretty much ignores the point of jobs really. The point is that they're specific versions of classes that trade versatility for power/utility.

If you're using Monk, you'll mostly be in a situation where you don't need protect (I.e. 8+ person fights, with a white mage around)

Players can already equip skills from other classes. Its called the armory system.

You've absolutely missed the point, nice one.