I'm not underestimating how much phase skips help. I actually do and clear the content and parse well. I cleared A9S week 1. I think I know what helps during progression.
I think you're vastly overstating how much phase skips matter or how incapable MNK is of skipping the same phases. A9S was a walk in the park day 1. You think it matters at all for anything other than bragging rights that you can skip the Faust add? Are groups that have the DPS to demolish A9S struggling with Faust and other mechanics they sleepwalked through on patch day or something? Should they be kicking monks from their statics because they can't speed-run A9S faster? And how did this matter during progression? Groups weren't killing A9S before Faust during prog nor were they killing Faust on the first platform. Some at that point killed on the third platform and the difference between NIN / DRG vs. MNK and AST vs. WHM didn't make or break that push.
I'll be blunt with you. You sound like you have no idea what you're talking about. You're an armchair raider complaining about things you have no experience with and situations that don't effect you.
You're complaining about stuff people do with farm-status content they massively over-gear and out-skill and think it is at all relevant to job balance in progression.