Truthfully Monk needs a significant revamp.
I'm not fundamentally opposed to the direction SE have taken the job in recent years, I quite like the increased emphasis on SB making MNK an ideal job for controlling TP feed. The improved accuracy cap was a good fix, and we've been given some excellent gear to play with.
However.
The change to boost was colossally ill-considered, especially as the implementation was so half baked. When the change came in some of us spent hours trying to figure out precisely how it worked and what effect it had because its function was so opaque.
That's ridiculous! A JA should not be a puzzle to solve!
If they don't revert/modify this, I'll be annoyed (if not entirely unsurprised). The function of the ability is to strengthen the next attack, it shouldn't be a hard think to balance.
Chi-blast has become depreciated to being solely a means to apply Penance with. This again should be an easy fix. Make penance its own ability, and either increase potency/retain frequency of CB to revert it being MNK's sole source of ranged offence, or increase frequency/reduce potency to the point where its a viable pulling tool.
Chakra in itself is fine, a recast reduction would be nice and inline with the improved survivability of most DD's these days, but mainly the issue is the pointlessness of Invigorate.
Make Invig its own ability and make it give regain not regen. Its not inherently unbalancing given how little many h2h ws benefit from TP overflow and this could be moderated safely based on recast time.
Mantra is mostly fine, although its ability to overwrite Dark's D3 drain boost could stand to be addressed.
Counterstance should probably be revised inline with the change to Footwork. This is a difficult one due to its potential to be so impactful, so I suspect we'd be better served by removing/reducing penalties but shortening its duration rather than making it full-time but mediocre.
The rest, I can live with as-is. Obviously a small upgrade to H2H ws damage would be very welcome though.