Always Wondered about Divots

I’ve played golf for twenty five years, and have taught golf for nearly twenty. But if a player takes proper posture (which soles the club AT ground level) and makes a proper swing (maintains posture throughout the swing and returns the head to the address point), why should the club enter the turf below the spot where the club was set at address? Then add to it the proliferation of “ground force” which most would say moves upward at impact, why again would the club enter the ground below the level set at address? I do know the shaft bows toward the turf at impact, but that would effectively make the shaft shorter than it was at address.

This is one I’ll be looking forward to read the answers, because my mind tells me a divot should never be taken, but nearly every golf does, including me.