My 2psi...
Local normalization of deviance from logical safety standards do not make it right.
It's no different than an OW instructor taking students into swim through wrecks or reef structures. Will something happen? Probably not. But those people have no business in an overhead environment.
The question I ask is this....if you do that dive without a light...will you be in zero vis? If so..it's a cave dive and you should be cave certified. If there is still natural light, you are in a cavern and should be cavern certified.
Either way it is a dive into an overhead environment and the VAST majority of divers don't belong there. Want to do cool dives? I'm all for it. Go get the training so that we don't have to hear all about how accomplished and skilled a diver you were during the A&I thread that follows your demise.
Tana, in no way is this directed at you...more or less a PSA.