Flamethrower is purely aoe move, like bioblaster. What is the reason you would ever use it in single target? Oh, you want it to give heat? You know that one of the reasons mch was so hated in sb aside from wildfire is because flamethrower was just channel ability used just for heat?
Bring back normal 1-2-3 combo that would become heated at 50+ heat? Oh, remember how fun it was in stormblood, when you dropped after burst phase to 0 heat and had to sit around doing weak shots for 10 seconds?
Latency existed before as well, but before even i with my ping couldnt fit everything in my wildfire, while now i can use it at top damage reliantly. Oh, burst phase with putting all your gcds and ogcds in 10 second 25% dmg up window was completely ping friendly and not clunky at all, which made the job most popular job in the game.
I suppose devs should bring back sb iteration and make mch the clunkiest, unforgiving and the least played job again. Cuz thats what was fun about it, right?