I will say the design of call in units that pop out of buildings is silly. Its a cool concept but both the ppsh 'partysans' / ATs as well was the 'fuljamwangers' are both dumb. They require no upgrades, no time on the field, and allow you to wipe units on retreat (or reversing tanks) without much skill or pre planning.
Their access to shreks/close range automatic weapons is their real issue but without them the units are useless. Both AT partisans and fallskjermjeger have access to an AT snare as soon as they pop out and as should receive a slight cool down on AT snare. AT partisans should not have access to a snare and should require you to deploy an AT nade before their deployment.
Sry for bad grammar, typing on my phone lol
It's a pretty frustrating mechanic to play against at times but it's important to keep in mind that no commander with infiltration units has any form of late game armor call-in. In fact the only late game abilities these commanders have come in the form of an arty strike (scavenge), a howitzer (reserve), and mark target (partysan), so picking a commander like partysans or scavenge means you HAVE to take the advantage early because you will be at a disadvantage later. In that regard I'm OK with the infiltration infantry being a bit devastating when they first show up because if you can outlast them you will have a strong advantage late game.