I was talking more about drinking itself, than diving.
It makes little sense to drink alcohol, unless it affects you in some way. A low tolerance person might get a buzz after half-a-beer, whereas a high-tolerance person (of the same weight) might have 5 beers and only really feel the urge to pee. Being high tolerance often means drinking more. Regardless of one's "tolerance" there's still a certain BAC (blood alcohol content) depending on how much one consumes.
The part I (thankfully) don't know from experience is how that interacts with diving. I've done all kinds of activities after 6 (or more) shots of vodka, but those were in relatively safe and controlled environments. However, how does having a high BAC interact with being cold, narced, loaded in scuba-equipment, and task-loaded, and then something urgent happens like my regulator starts leaking?
Perhaps something I can point to, is around the end of my drinking, I was increasingly becoming nauseous at complete random. Lots of people have thrown up in their regulators, but knowing how I typically lose control over breathing and can't really do much else when throwing up, it's not something I'd want to do underwater. I had to throw up once while swimming in a lake without any floatation nearby .... not fun, or safe.
---
I'll throw in a basic disclaimer that I'm not trying to project or lecture anyone. I started solo-diving long before any agency would recommend, but I also offset that with lots of redundancy, taking my time, and staying well within my limits.