I actually like this. Too many times I've been on the giving and receiving end of matches where the game's over as soon as the other team gets heavy control. Grab your box and kill another guy for a box and you can reliably use your HMG until the next box spawns. Heavy should be a reward from having map control imo and too often a bad spawn or single mistake while having heavy can cost a team the entire game. I'd be for adding it back in if there was only 1 shared heavy box that spawns per map.