MNK could have easily had a rotation similar to BLM astral and umbral but for fire and wind fists. The closest we got was the pre 5.4 opener with fire into wind. A real missed opportunity for the weaponskills to change in their respective stances similar to how the Inner Chaos works. It would effectively double their gcd rotation without actually increasing the skill bloat. Imagine FoF doing some beefy crits and DH then switching to FoW to apply dots and buffs. Some examples of the same skill but in different stances:
Fist of Fire dmg +5%, GL4:
-Bootshine deals 100% Direct hit crit with DK buff
-Twin Snakes increases chakra gauge by 1 if performed from rear
-Demolish reduces cd of elixir field and shoulder tackle by 5 secs
-Snap Punch unchanged
-Forbidden chakra increased potency
Fists of Wind dmg +5%, GL4:
-Bootshine unchanged
-Twin Snakes adds movement speed for set duration regardless of stance
-Demolish unchanged
-Snap Punch adds a dot
-Forbidden chakra refreshes all dot timers
Just some random ideas. All I can hope for in 6.0 is that MNK doesn't get another skill that counteracts its playstyle at lvl 90 i.e. Six sided star.