Take a map like Kolodny Ferma for example. A sturmpio rush into a key building like the church, or even the house near the West base is almost uncontendable.
Does not compute, either they rushed it and thus have no volks on the field, or they didnt rush it and you didn't take it.
Almost any SU t1/t2 unit will force OKW out of a building, so whats your issue?