The only reason that players don't know their skate specs is because they have the equivalent of personal assistants in their EQMs that take care of every detail for them. So yeah you can be picky without necessarily knowing the exact specs that you skate.
I doubt that EQMs decide on hollow, radius, profile, steel, holder etc like on that chart without significant input from the player.
You would have a lot (high majority) of unhappy players if you just handed their skates to a random sharpener before gameday and say do whatever you feel is appropriate.