This is a refrain I heard more than once on a recent trip, while getting castigated for diving to 75 feet alone in crystal clear, benign conditions using independent doubles. Never mind that there were people zipping around on scooters on single tanks, 100 feet from their "buddy" (because what the heck, they could still see each other), or there were guys on rebreathers diving inside wrecks below 200 feet and losing sight of their "buddy", as each went their own way while exploring the holds ... that was OK with the dive op, because they went into the water together, and therefore they were somehow "safe".
It's horse manure ... people don't die from diving alone. They die from poor planning, bad decisions, inadequate preparation, or simply not having the chops they think they have when something unexpected happens and they suddenly find out they're not equipped to deal with it.
It'd be different if the agencies that promote this sort of nonsense would actually train people how to dive with a buddy, rather than simply telling them that they're supposed to. I see too many examples, regularly, of people who know the slogans, but have completely missed the concept ... even, lately, among some who have trained with the so-called "team" diving agencies.
Diving with a buddy won't remediate bad decision making, insufficient technique, or a deficiency in awareness skills. It won't prevent people from doing stupid things, or pushing their limits beyond a point where they can deal with what should be a routine problem. Buddies can often be the source of stress during a dive ... and underwater, stress is not your friend.
I really wish, sometimes, that the dive ops with the "no solo" policies would come to their senses and understand that a properly skilled and equipped solo diver is, in many instances, safer than the guy who's out there with a clueless dive buddy ... or one who's so distracted by their camera that they neglect to look around every once in a while ... and nowadays, pretty much every vacation diver carries a camera, which makes both them and their dive buddies, in many cases, unsuspecting and ill-prepared solo divers.
Slogans like the one in the title serve a purpose for new divers ... they help them remember important concepts, assuming that the concept was learned at the same time the slogan was. But after a while I think they sometimes do more harm than good. Enforcing policies out of a blind adherence to a slogan often result in less safe conditions than the ones the people enforcing those policies think they're trying to prevent.
I had a great time on the trip ... but if there's one thing that would prevent me from using that dive op again, it's their no-solo diving policy. That, and having to listen to some dive guide spouting silly slogans he really doesn't understand ...
... Bob (Grateful Diver)