I think it makes as much sense as Panzergrenadiers blitzkrieging through the Soviet Union with Panzerschrecks in the early 40s, the Panzerschreck came into service in 43' I believe, along with the Pak 43 and Ferdinand/Elefant as well as the Panther, but seeing the current Ostheer it more reminds me of the 41/42 German Army rather than the 1943/1944 one.
Guys, this whole concept of "what's one more inaccuracy if this exists already" is a dangerous rabbit hole. The game needs more authenticity, not less, and we should aim to keep what WWII polish it has left instead of making it into Battlefield V the RTS.
The riflegrenade smoke can easily be replaced by a standard smoke grenade with equal range. I'm also sure there are far more options than just adding a mortar HT. Pack Howi comes to mind, as they were sent in great numbers to the British airborne units.
Point is, we shouldn't dismiss the weight of historic authenticity. When there are historically accurate alternatives that can give practically identical in-game effects, we should always opt for those instead.
I hate the campaign, but there's no fixing that anymore. We should be trying to better the game, not drag the game further down this rabbit hole. I think this point simply cannot be stressed enough as it is often ignored.
On topic, the Pfuss have some great voice lines for StG44s, which is interesting, although any way I look at it, the StG44 would just create more weapon profile overlap with SturmPio and Volks.