Look dude it isn't an advantage to be doing less damage no matter the reason.
Lower damage is merely a by-product of the higher suppression. The higher suppression is the advantage, merely because it comes with the lower damage does NOT mean that the lower damage itself is in any way advantageous.
Please stop trying to make this argument, it's absolutely nonsensical.
Actually, higher damage is. Detriment to an Mg. Look at the vickers whom notoriously bursts down models. This leads to requiring a target and slowing down pin rate
It has advantages too, like units in buildings and light cars ect but all in all more damage seems to be counter to the primary role of MGs