You make good points, and ideally yes we should design jobs to be like PCT - but we also have to be realistic with dev time and how fast they can actually do what we want VS how fast something needs to happen. It simply is not realistic with how much needs to be redesigned to make this work properly, and 8.0 is still a long way off.
I'm basing my suggestions on what can be implemented fast, with reasonable adjustments by the dev team without going for a shot in the dark and reworking everything. The worst thing right now is them doing nothing, the second-worst is just doing a round of buffs to every other job to avoid nerfs (which they might do, much to my dismay) because that simply has a lot of room to upset balance pre-Lv100 for Ultimates.