this is not true, yes they would share buffs but there play styles would still be very much intact.
pressing a buff button does not distinguish a job from any other job.
the reason i put forward a proposal is to get people thinking of solutions to help SE out not to just constantly whine for buffs.
some of your points are very valid and should be addressed by SE but in the case of jobs applying there own damage buff like piercing it would just make it pointless and they could just remove them in favour of the dots we lost.
if they were changed to other jobs roles applying the buffs it would help balance out group composition to role types not to jobs themselves, also if a group wanted they could still double dip into any job type depending on what people wanted to play.
I'm not saying what i propose is the best solution but atleast like so many other threads right now its not saying we should all just be given buffs to make our jobs desirable.