It isn't a myth! You see, I was laid off for a while and after a time, I became restless and bitter and traveled the world, sneaking into practice studios weilding a screwdriver and an iron. I'd plug the iron in and let it heat up while removing the speaker cab grill, crease the poor defenseless 10's with the iron, and then replace the grill as if nothing ever happened. I'm employed again and am thus reformed and no longer crave the crease as I once did. I sincerely apologize to anyone who's speakers I creased. It wasn't personal.
Seriously, I've played and serverely abused Eden cabs with 10's for over 10 years and never creased or blew a single speaker. I've blow the light bulb a couple of times back in my slappy days, but the drivers have always held up.