none of that is an issue - i have Fully Loaded aced and play aggressively ¯\_(ツ)_/¯
That doesn't make it any less bad, in fact it just makes other SMGs look even better by comparison.
Blaster with the extended barrel, fof, full-auto, extended mag, and stock can rack up 40 damage, and while the accuracy while doing so is rather poor it has more reserve ammo than the kobus while also having a higher pickup rate that allows you to make up for missed shots easier. The Uzi with the fof, foregrip, and stock can pick up 40 damage WITH good accuracy and fire rate.
And the Patchett. Dear god, the Patchett with long barrel, comp-comp, and solid stock can get 45 damage, 18 accuracy, and 22 stability, which basically makes it an assault rifle for your secondary slot. Ammo reserve is a bit low but the slower rate of fire ensures less wasted shots and you have fully loaded aced and play aggressively anyway so it doesn't matter (ツ)