I think it’s logical, but it’s sort of like, if it was that easy why didn’t they do it sooner? And why wouldn’t guns work the old way but “reloading” just instantly dump all heat?

Come to think of it, hearing myself say it out loud, this is exactly how the laser rifles work in Helldivers 2 lol. They overheat slowly. If you fully overheat them or release early they swap out the current heat sink for a new one.