Point of the Job System?

[Dreadnought]

With the new abilities, we're essentially very constrained as it is. Not that I mind defined roles, but it does seem like a job system on top of a job system is coming. I'm curious.

RIGHT!!! thats what im saying! our current classes are constrained as it is. were already Jobs, i dont understand the concept of being jobs on top of jobs. i mean, is the only difference that we wont be able to cross class any abilities at all? 100% constrainment instead of 90% constrainment?