MCH lacks depth. It has great toy-animations, but they dont work with each other.
Flamethrower doesnt interact with heat gauge.
Flamethrower interrupts OGCD damage rotation for 10s. It has basically no use in savage content, unless adds exist.
Wildfire is a weak "weaponskill", as many mentioned it cant crit,dh, etc.
Queen cant be controlled, sometimes she attacks random adds (e.g. 2. Extreme Trial Add Phase - No spoiler)
Adding new "skills" to Queen seems useless to me. They could add higher potency on her final attack and call it a day.
This also delays the "callback" mechanic if a boss is about to get invuln, since Pile Bunker > Crowned Collidor costs extra animation time, hence a possible dps loss.

The "balance" patch 6.08 is a joke for MCH. It feels like a small bandaid to shut up MCH players.