I have a number of things to say, but I'll slam my nose into the thousand words and keep going, so I'll keep with one prevalent question.

Obviously in your system, Jobs wouldn't be able to play like classes. As a job, you sit still you die. I realise you are having trouble explaining yourself, but it sounds like you'd have classes trump jobs in trms of raw power, being able to sit still and ignore mechanics with preparation, Would you then be able to play a class like a job and get the best of both worlds? Maximize Damage by focusing all your preparation on the hurtin the enemy side of things and save yourself the damage by keeping up your mobility? Cause that sounds a little uneven.

I'll comment again with other points later.