Having tested on a dummy for a bit now, I think these changes have made MCH more fun to play than in 4.05, but not nearly as fun as in 4.0. Heat management is now non-existent in perfect play. Unless you have incredibly high skill speed, there is no need to ever use Cooldown unless you are already overheating, which feels all sorts of wrong. Your shots naturally bring you to 85-95 heat before your next Wildfire with no need to ever reduce your heat, so then you just tap Flamethrower to overheat. We need something like 10 heat per shot, for ammo to not prevent heat gains, or a rescaling of the heat gauge numbers to make heat management interesting again.

As mentioned by others, replacing Gauss Barrel and your turret are also just annoying things you have to do once the respective timer elapses, and are not really meaningful. Having Gauss Barrel reapply itself or Barrel Stabilizer apply it, and just disabling the turret instead of destroying it would be some very nice QoL changes.