ilv is more so of concern once you reach level 50 as your class/job is 50 but the gear makes it so that your level 110 or so.
End game gear comes in various levels, like 55 which will be your end gear from your class, there is level 60, 80, 90, 100 and 110
I probably missed some in between. It used to be that myth gear which is level 90 was your best and while still available because SE made it so easy now to get gear most new players go straight to the level 100 gear ( upgradeable to ilv110)