Cleric Stance Discussion - Is it needed?

[JunseiKei]

So these calculations aren't even based on a party doing the content at minimum ilvl? in addition, jobs need to build into max damage, which is lost if the boss decided to not be targetable.

Right. Minimum ilevel requirements are apparently for the absolute minimum you can have and still have a shot at clearing (made all the worse with those that further go into things under-geared).

Most jobs have tools to compensate or players eventually learn when not to use certain cooldowns for those down periods. Learning when to not use things in accordance to the fight is also part of learning any given fight. This is also where sites like FFlogs becomes increasingly handy to compare against other players. You can see when they use what at any given point in a fight to help optimize your own play.