The thing is, current job design is made for that perfect buff stack alignement with burst and that is what annoys a lot of players.
If it disappears, or becomes significantely rarer, then the need to constantly stack everything in the same 10 seconds window does as well, unless all fights are designed to have a single 10 second opening to deal a DPS check that would require that kind of damage.
It's a communicating vessel kind of thing, one informs the other.

Having buffs on varied timers that rarely align would be neat as well, but also might make some comp more "competitive" (aka: X job's buffs align more often with the burst of those DPS so you should always pair those) which leads to all kind of issues we've had before (hello dragoon and bard from SB)