The Problem:
In the vanilla game (A Realm Reborn), A-Ranks are level 50 and are on a ~6 hour cool down period between spawns. With Shadowbringers allowing players to reach level 80, all vanilla A-Ranks can be soloed. New players and even some veteran players will be unable to get allied seals via A-Rank hunts because there is no longer any teamwork involved in taking out these targets.
The Solution:
There are a few options I have considered, each with their own pros and cons.
Option A) Turn Vanilla Hunts into Fates (Allied Fates?)
Pro: Like other fates, this system will force players to level sync. The A-Ranks will no longer be something a player can solo.
Con: People are more interested in Shadowbringers hunts now, so getting people together for ARR Hunts could prove challenging depending on the activity for your server.
Option B) Faster Spawns w/ 1 Time Daily Reward per Hunt
Pros: Fast respawn gives everyone a fair shot at getting seals. Less reason to hate your fellow gamers.
Cons: Players under level 50 would be at a greater risk in areas where quests are involved since a lot of A-Ranks are hostile and can spawn in lowbie quest zones.
Option C) Increase the level of all Hunts to 80 across all content.
Pros: Players would need to team up to take down hunts on all continents. No hunts can be killed by solo players.
Cons: Low level players would be at an extreme disadvantage with hunts prowling around their quest areas, and without the option to quickly kill a target, low level players could potentially be forced to wait hours to complete their quests because they can't reach it and nobody wants to kill the hunt.
Additional Notes:
1) The situation / experiences people have might vary from data center to data center. Some people might be very cooperative on one center, where others might not be on another. There is no one blanket solution the players can come up with without direct involvement from the developers. While hunters might make an effort to announce hunts and gather people so all can benefit, the fact remains that lone wolves exist and people will hunt targets without uttering a word to others.
2) I don't know how long the timer actually is, but it's my understanding it typically takes about six hours for an A-Rank to spawn between deaths. Since there are always new players coming to Final Fantasy and always players who want to acquire allied seals, it seems appropriate to give them a way to acquire them without having to compete with players who are max level.
3) I didn't consider S-Ranks for this list because I don't know how many people lone wolf them. It's my understanding that S-Ranks remain something that most hunting linkshells will coordinate to tackle, even in A Realm Reborn.