In reply to PaulJepson:
> If this climb is an exception, then why? And should it be?
I think the original statement that there are certain criteria is pretty spot on. There are climbs that could easily be utterly destroyed by climbing them in the wet, climbs that rely on pebbles, smears, flakes that could break etc. As such, it is a pretty good baseline to state that as a general rule it's best not to climb wet grit, especially as that messaging got developed as some horrific practices started taking place, people blowtorching rock, people smearing holds with chalk to "dry" them (as a visit to plantation will easily show...) and more.
However, none of that applies to the practice of climbing Christmas Crack on Christmas Day. For starters, it's a crack climb with horizontal breaks and ledges. If you somehow found hoards of thousands of masochists climbing it under these actually rather unpleasant conditions with extremely poor technique, it will start making a dent. As it stands, that's not what happens at all.