I don't recall them ever saying this in the Live Letter, though I may be mistaken. I recall them saying that they wanted to open up the job to add more flexibility and creativity in rotations, which is certainly not what we got. But then again, I feel like a lot of stuff was also dumbed down because you have the easily-amused players and casual players who didn't like double-weaving because it required effort on their part, and the same goes for positionals. Lowering the skill ceiling is never, ever, EVER a good idea for balancing in ANY game. You want to raise the skill floor. Could MNK have used some streamlining? Absolutely. Is that what they did? No. It feels like they designed things which sounded neat on paper but don't really work in practice, Anatman being a fantastic example of this. This feels incredibly dumbed down and the MNK population is going to die out if this isn't fixed ASAP.
Seriously, it really only needs these two oGCDs and one of them can give a GL stack. Such a simple solution and it immediately resolves otherwise catastrophic problems. Best part is, the animations and icons have already been made so they just need to reintegrate/migrate them into the current PvE build. From a game development cost perspective, that's dirt cheap time and money wise. There's no reason why this can't be done by the very first patch, IMHO. Let them keep their same PvP tool tips, just give them 120-second recast times. Keep PB the way it is. Then you can save PB for a recovery rotation, use one of these oGCDs in place of Wind Tackle and then instead of having the opener be looped every 90 seconds, it just loops every 120 seconds to compensate for a few extra goodies like SSS, the boost to Meditative Brotherhood and the reduced recast time of tFC. The extra 30 seconds balances out with the new toys so that's fine by me.
That's it. All you need to do. Two measly oGCDs that have already been made. Let them keep their potencies and let the recast times be long. That's a good way to both balance Somersault's high potency and free chakra stack, and Axe Kick being an AoE with low potency but that gives you instant GL3, which would certainly be handy in dungeons and a long recast time prevents them from being abused. It's stupid simple. This is all MNK needs and then it's fine, without touching anything else.