that is a bad design decision.
Probably, I haven't thought as much about the DP-28 as I have the PPSh's, and honestly I don't prefer it since LMG's are already done by 2 of 5 factions. It just peeves me that the Soviet Army's portrayal is just so strange: all Conscripts and Convicts, very few SMG's or LMG's. The DP-28 is a pretty poor excuse for an LMG so I thought 1 probably wouldn't be too bad, but at the same time the Soviets are designed to suck at ranged combat, so it can have unpredictable consequences allowing them to use a ranged weapon. I still prefer the PPSh as a mainline upgrade because they would be the only faction to get an SMG on mainline, as opposed to LMG (OST, UKF) or AR (OKW, USF).
This post is kind of rambly but I'm very tired, sorry.