I believe it was for PVP purposes and the fact that sometimes even after several minutes has passed since the heavy drop, some people are still running around with machine gun ammo effectively using it as a primary.
The counter to this argument is that in the D2 beta, the fusion rifle gets six shots after picking up power ammo effectively making it the new "machine gun" of D2 so to speak.
Thoughts?
[i]~Nyahh! =^,.,^=[/i]
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Edited by HollowedWayfarer: 7/25/2017 7:20:10 AMIn full honesty, I would have been completely fine with Bungie nerfing the damage on machine guns and putting them in the sequel as a primary. But no, they had to take them out of the game completely because of the f-ing PvP cry babies!