Strong Points are largely irrelavant in modern warfare in open battle as your average infantry platoon can call down enough firepower to destroy a small country. However in urban warfare strongpoints become critical with fortified houses on street corners being fought over for months at a time, that is thier importance. However I'm not well versed on the subject, I do know however that most commanders disdain strongpoints in open warfare because with the fluidity now common in wrfare most strongpoints can be bypassed and strved into submission.