If we do look at the competitor Warcraft, Haste functions better there. They even have an OP 30% Haste buff window provided from Bloodlust / Heroism / Time Warp. Although they handle party DPS buffs differently to make it possible. If there are some additional changes in the latest two expansions that change this a bit, apologies for missing them.

The main difference is the buffs are essentially apply and forget for 30 minutes to an hour. They are weaker versions of our FF14 buffs that are persistent for every moment. Two classes that provide the same type of buff do not stack either and just overwrite each other. In a way, they function like our buffs that are provided by having a certain role in the party (Eg. 1% all stats if a Physical Range is present = Blessing of Kings for WoW Paladin). The only other buff window I remember would be DPS potions and those can be independent for everyone too. As a result, you can drift away from other people's burst all you want and it would be okay in most cases. As long as everyone at least capitalizes on the 30% Haste window first. The debuff cooldown is so long that you usually expect just one per encounter.

If we translate this to FF14, we would either have to remove the burst party buffs like Battle Litany or Trick Attack or purposely desync their cooldown timers. The former would be way easier to do since a 1 minute timer still meshes well with 2 minutes. Other than that, reducing cooldown timers from Haste would be bad with what we got here.