Another one of these threads, huh? I guess we're all a little bored with the pandemic.
Considering many many many thousands of recreational divers have done many many many thousands of dives to 100ft on AL80s for many many many years, and survived just fine, how is it that you think this behavior is "insane"?
Honestly if you're that uptight or self righteous about dive behavior, I just don't see how you can have any fun at all, what with everyone around you being insane.
Sorry for the rant, I'm just a little tired of the pedantry of some of these 'questions'. I won't bother you any more, apologies.
So much of this issue is with respect to experience, confidence, and composure.
There is such an ingrained institutional conservatism exhibited here that is more of a scare tactic than a learning moment.
So much is discussed about being mechanically and mentally prepared for diving.
We all know that if you are not comfortable with any dive, then call it. That is the message that we, as experienced divers, should deliver.
Setting up hypothetical scenarios and debating pros and cons accomplishes nothing.
Presenting real world experiences, and their outcomes is how we exchange knowledge and inform others.
I have been accused of having “survivor bias”, however I would suggest that is “learned experience” that can be shared.
The key is that we all dive to our own level of confidence, and we, as divers, should either know what that confidence level is prior to undertaking a dive such as the OP outlined, but if we question it, know that we should not assume that risk.
Somewhere out there, common sense must prevail.