Bad idea, as a pld i have 3 gearsets for different types of fights. This idea would mean 3 times the amount of glamour prisms. Then there's the fact they don't want to add too much data to gearsets, which led to the emperors gear glamours.
If you tied glamours to jobs, it'd be a pain too as this would hurt those who use different gear for different places e.g. town wear.
If you want to fix a problem you don't want to make more problems.