My take on what can be changed for FFXIV

[DrWho2010]

Again, though, literally none of what I suggested accelerates BiS on your main. It solely allows you to grind your other jobs up to the ilvl of your main, rather than forcing only one gear class to be competitive per tier.

If, as you say, no one is currently sticking around to multi-job competitively, then what I've suggested has in no way let them gear faster or given them reason to leave earlier.

then there's no reason for the devs to implement a way to let people gear other jobs faster.