Think this is more of a balance issue per se - personally I don't mind it because it's currently a bit easier to AT infantry bazooka blob as USF than any other faction and at least the minimum range means that a blobber has to respect crushing a little. (Even then its usually suicide for the tank). I think its a fair trade off seeing as how USF gets snares for "free" with Vet.
Requiring combat and vet 1 for each individual Riflemen squad to be able to use an unreliable and insanely slow aim-time snare compared to Sov, Osth, and OKW getting their snares universally doesn't feel fair to me. If USF had any sort of mine non-doctrinaly then I think the current Riflemen nades would be fine.