No one who had climbed 7th Aardvark would sensibly give that 6c though Will. Main Overhang used to get 7c+ before the hold broke.
Chiselling is interesting. Took Leachy a while I think? Typifies the subtlety of grading that E grades can give as E5+6c is clearly safe, short and bouldery which doesn’t come through the sport grade on its own. So not a perfect system because the technical grades are far too wide IMO, but not hopeless either.
Ultimately, each works pretty well for what they were designed for; they aren’t the same things however, so the conversion is likely to be approximate.
