I especially like how satcheling a building with an MG42 in it manages to kill a single model and tickles the others.
I thought people were exaggerating until yesterday I threw a satchel on a small building with MG 90% hp and 4 models inside. I killed 1 model and did about 15% damage to the ambient building. That's ridiculous. Their only utility is satchel plus durable flame platform and with flame damage being worse against garrisons than before and with satchel not able to do much damage to garrisons, I see no reason to build penal troops.