If that is your reasoning then how should Assault Grenadiers, AI panzergrenadiers and obersoldaten avoid these situation?
Well unfortunately nothing. Obers and assault gren have been since day 1 invitations to be abused by vehicles. Shock troopers are also in this category. Panzer grenadier at least have the threat of 2 panzerwchrecks popping out. PanzerfauSts on assault gren with t1 built and schrecks or fausts for obers shouldn't be considereal heresy. Shocks are harder to pin down. They got smoke at least.
Is the AT-satchel linked to the PTRS upgrade? If so you can skip this question.
Unfortunately so. It makes it extremely hard to use since each penal has to be upgraded individually for access using munitions to use munitions. Then the squad has a big ol beacon of a ptrs signalling axis light vehicles which unit to maintain a distance of 10 from.