sooooooooooooooooo, you're telling me I should build a mortar just to attack ground to destroy a building to protect my sniper? t1+t2? or use up 90 munitions on every building i see for units that may not come?
Well thats about the only thing possible to fight ppsh partisans not wiping retreating units/sniper/weapon crews.
Its your problem if every building is your problem, i myself would only destroy/boobytrap those on my retreat path or near weapon teams.
With the popcap update last patch its no use to put that lone pioneer/grenadier inside those buildings to stop them from popping out...