At one point, under the ASP, tour surfers were pretty concerned with being underscored if they rode anything fishy/alternative/stubby. (as I remember they even sent all the competitors a letter stating such) Someplace in the 90's I rediscovered some 80's grovel boards and had new versions made. One tiny afternoon a certain tiny pro paddled out and asked me what I was riding. I showed him. He laughed. "That's a cheater."
"It seems to work."
"Yeah, but it's cheating."
"Ok. At this point I would just like to say that you are surfing really well for someone intentionally handicapping themself.”
The conversation eventually got hostile if you can believe that.
But yeah, I heard a number of pros say "I can't ride something like. They won't give me a score." There was a lot of resistance.
I credit the change in acceptability to Dane Reynolds and that whole Dumpster Diver/WD thing. They couldn't deny him. That was what 2009-10? Small wave boards got shorter, rockers dropped.
I don't think ultra short stubby boards are a great visual in a subjective judging format. A 12 o'clock lip smack looks way more spectacular with some nose poking up there into the sky. IMHO. I think maybe the judging has moved past the prejudice now though.
None of that has anything to do with asymmetricals