Agreed.
Don't get me started on the use of 'Unc' when circulation is obvious.
That's my grading scale base mark, from where the scale up from there (corrosion, finger marks, bag marks 'carbon' spots, lustre etc etc) and the scale down from there ( circulation amount, corrosion, flaws, damage etc. etc..) are centred.
When that point moves, the scale is ruined, even if it was never intended to be a relative comparable scale that someone else can use.