The issue of a move not being what it seems to be in a form is one that caught awhile back and one I never care much for.
The fact is:
The majority of attacks to which one blocks in a form are NOT strikes but attempts to grab.
Strikes come to fast and don't "stay" there long enough to be blocked ( typically) but grabs and attempted grabs do.
Many low blocks are actually low hammerfists or low forearm strikes and not blocks to kicks.
The upper block of karate, for example, in the majority of forms is a raising forearm smash, typically done VS an over head strike.
The bunkai of most forms stopped being taught and what was taught was crappy more often than not.
Blame the teachers and their teachers.
Psalms 144:1
Praise be my Lord my Rock,
He trains my hands for war, my fingers for battle !