The truth of the matter,

They made so many different grinds, from a true full wedge step by thinning step all the way down to an extra full hollow... Why????

Because people are different, it really is as simple as that, what you might like and think is the cat's meow honestly, doesn't make a bit of difference to the next guy...

Figure out your best Grind, Size, Point, and even Steel and stick with it... But to actually try and decide why a grind might shave you better when it doesn't shave the next guy better, using a scientific process is unfortunately a bunch of hooey, as one man's trash might be another's treasure...