It certainly feels like a not fully thought or implemented idea. A bandaid rather than a transplant. The fist stances still being there/being the same as a disappointment. If SSS keeps its long gcd it will remain a niche ability. Anataman has to be useful in some way. They can't be that dense. Either way it keeps Mnk with around half a dozen skills that are either very niche or downright useless in most play. With what Yoshi said saying "because this isn't an expansion no new skills right now" I almost have to wonder if this is indeed not the full rework and a better one will come next expansion. It just feels too shallow right now.
That said Mnk will likely see a 10-20% power boost with TK being oGCD with no further restrictions, PB being stacked and not needing a coeurl skill to maintain GL. Also opener will almost certainly be Formless > Dragon Kick > Leaden Bootshine now. We'll be strong, we'll just continue using the same six skills with 2 oGCD thrown in every 30-60 seconds.