So I haven't played as much monk as i have some other classes (only got the class to 75 this expansion), so it's possible that my impressions of how monk plays may be that I've just straight up missed or misunderstood something, but what struck me in stormblood and what seems to still be the case is how little their two stacking features interact or synergize with one another.
With the 5 chakra I find that I'm either at 5 or not at 5, and the whole point of getting to 5 is to hit a button and reset it. Greased lightning stacks may impact the speed at which I get back to 5, but that's kinda it - Chakra 1-4 don't seem to serve a purpose and the whole system seems to further discourage using Tornado Kick.
Personally I wonder if some of the problems with Greased Lightning falling off, the MNK kit wavering between wanting you to keep stacks or use them, etc. could be alleviated by making Chakra more interesting - given that we can build chakra when not actively attacking, more skills that use chakra (potentially during downtime) could be what the class is missing. This could also help with downlevelled content where the entire MNK kit vanishes, since the class quests that deal with opening the chakra is in the 30-50 range anyway - and during that whole sequence of quests, much like the use of chakra in combat, I didn't really feel like the class became something different than Pugilist for chakra 1-4, since nothing really changed for how I was playing.