I wouldn't exactly call it's mechanics complex though. It pretty much has only one mechanic right now: Wildfire. After changes to the cooldown of barrel stabilizer and the overheat buff, heat is just another buff you use during Wildfire. As long as you're pressing everything the moment it becomes available to use, you'll never have to use Cooldown to manage your heat because you overheat every Wildfire and you won't overheat faster than the time between Wildfires.