
More than this, there are 2 more reasons to keep it:
1. Whithout DPs you cannot button and DPs are not cheap;
2. You cannot kill a vehicle with it unless you used combined arms (button is pinning the vehicle while othe AT weapon is firing at it) which is a proof of "combined arms" thinking (a bit rare in the soviet spam faction

from realistic point of view, yes, it is stupid.