Good point about sighting - I agree a result of this change will be that (against OKW) sending an allied tank to scout the FoW may no longer lead to instant death.
Admittedly I Haven't seen AT rushing with grenadiers but I have seen it with Osttruppen blobs. Cheap replaceable infantry that can faust-spam a light tank to death if one has enough munitions.
Here's where the comparison falls down though - shrecks only require the unit to be stationary, don't require munitions & selecting to fire each time, have a faster firing animation, and do far more damage and have higher pen. Therefore on a risk/reward scale I still think we would see this bumrushing behaviour a lot and to me a downgrade on the type of AT volks get seems a better solution.
But hey, I'd be up for testing it in a balance preview mod and letting the results speak for themselves!
it costs manpower to replace volks that get killed while trying to get close to a tank. recklessly charging at a tank will just get you shot up and take a lot of unnecessary losses. it costs nothing to repair vehicles other than time.