Again, which squads?
How large army you believe someone with bofors, pit, FA and possibly something else in the area will have?
It isn't exactly menpower light and you'll have to sacrifice something, which is either infantry presence or delaying armor due to lack of mp.
AH. U think in this way: the brit build his mortar and bofors and it cost mp.
THis mp he hasnt it for building squads. Did u know that this emplacments make seriuos dmg ...exspacily vs infantery?
so this mean...yes it cost mp to build it..but they will deal dmg so your oponent need to retreat and reinforce ...this cost mp! u need to kill only 10 models with mortar emplacment so the enemy need in most cases 300mp to reinforce...hups! ur emplcemnt paid for it self. after the 11model u have the advantage. And now dont tell us: than cap the other side. in most cases this emplcament safe most important points. or u play teamgames and can easily safe ur side while building up ur army.
u doesnt care if u bofors/ mortar will killed in the 15-20min mark. it safes ur area vs anything till mediums armpor comes on field. ur theory from killing emplcament without no mp bleed sound good on paper...doesnt work in realtiy.