Yes, please Relic make PTRS a valid AT weapon.
Although I would like to point out you may not like this change.
If PTRS becomes an AT only weapon, goodby Guards. Guard are actually doing fine because the can counter light armor and prevent mediums from rushing your troops. Just Button and watch them do their job. With the buff, even without DPs they can damage infantry, and can counter MGs, PAKs and mortars, Which in my opinion is fine. Even for partisans it's really interesting, bring in partisans and use them as Weapon Team destroyers. They are actually performing as Anti-Material weapons (I'm not arguing IRL or history, just pointing out this mechanic is interesting)
But the same AT/AT and anti-team weapon damage for cons is the problem. So, units who have access to PTRS should act more or less like Elite infantry. Guards do (Unrelated, but DP-28 Drop chance should get nerfed). Cons on the other hand, they become abusive.