Soviet arnt getting a free pass, sandbags are integral for conscripts to make it to their very late weapon upgrade what's more is that it's key to their role as support units.
Conscripts are mainline infantry, not support units. They have merge which is extremely strong paired with an early flamer which is the meta in 2v2 at least. That's even ignoring the airborne SVTs that are also meta and allow them to dominate further. Dislodging conscripts from their sandbag spam is very tedious, especially as OKW.
They're getting a free pass.