You can get bogged down in the details, and everyone has a different idea of what would be the ideal way to get there, but basically what every single serious pvper wants is for the end result to be a level playing field. Whether that is late MoP/WoD style gearing where everyone gets the same Conquest gear, or Legion templates (with secondary stat customization), or ilvl cap based on bracket being played, people want to avoid insurmountable gear discrepancies in pvp.
We can also all agree that what Blizzard has done to pvp this expansion is atrocious.