As much as I am normally approving of adding more options and more comments - I'm going to shoot this one down with a couple of comments that is going to sort of tip the hand of SE's perspective here.

1. Open World PvP has no objective.

2. PvP has no individual Balancing.

This is critically important.
If there is no objective, there can be no team-based balancing. If there is no team based balancing, all of their team-based gameplay they have now goes out the window. It's effectively asking Square Enix to forego their entire motif for the sake of one mode and once again completely overhauling PvP Skills to focus on individual balancing. It's not a matter of they can or should, they won't. That mode is contrary to their standard of rewarding teamplay and their attempts fostering a positive community as a result.

What you're left with, is a severely disproportionate game that relies specifically on exploiting individual or group weaknesses. If one class is in meta and the others are out, those classes have a horrid time playing in Open World.

Here's an example - Healers as they stand now.

You can see it in duels, Healers in most one on one situations can't be killed. This means if a healer engages a lone player out on the field, there's pretty much zero chance of losing. They can harass that PvP Player continually. That situation is instantly unfun for the soloist out there.

The natural escalation of that is to gank the healer, which then instantly becomes unfun for the healer, which then devolves the Open World PvP into roaming gank-squads that prey upon any individual or isolated person. Or play in groups that best exploit any disparity in individual or group play balance for the sake of winning the most often. This would make the Red Headed Stepchild (Or perhaps Red Hatted in this case? >.>) jobs even more ostracized they are now.

At least in objective based play with team based balancing, these jobs still fulfill their roles and can secure wins even against Meta picks at fair rates.

These are all conclusions based off of SE's adjustments and content habits across the board. Untill SE overturns their core tenants of gameplay for FFXIV, the discussion of can or should is irrelevant - they wont. And from my perspective, they seem too heavily invested in their policies to push away from them at this rate.