I have no issue with DIR folks using long hoses but should they be recommending this configuration to a typical recreational diver not trained in it deployment, use or routing configuration?
Do see many typical recreational divers, using NON-DIR gear use a long hose?
I'm not sure who you are asking the question of. DIR/tech divers? All divers?
FWIW: I'm not tech or DIR, and not a tech or DIR wannabee. I'm not interested in overheads, hard or soft. I just want to fly over the reef with my wife and look at the pretty fishies. I'm about as recreational as it gets.
But on researching my first major gear purchase, with a lot of reading here, and really disliking the traditional octo that I could never find a way to reliably stow, I decided that to me, the long-hose/bungied-backup made the most sense of the three mainstream regulator configuration options. For a number of reasons that have been endlessly thrashed out here. I went that way, and I'm quite happy with it. I simultaneously went to a pocket snorkel I've never needed to deploy.
I haven't yet had to deploy it in a real air-share, but I did do a sort-of S-drill with my wife on our first dive together with my new gear. Not a big deal understanding it AFAIC, for either of us.
I also went with spring straps based on intrinsic benefits. Love 'em.
That's about it for anything resembling tech. It's not conformity with standards that motivates me. For the moment I'm really happy with my weight-integrated back-inflate travel BC and air-integrated console computer. If I ever go BP/W it will be to reduce travel weight and size further, but that won't happen anytime soon, if at all. Oh, and as my signature makes clear, I really don't care about the Men In Black (tm) standardization. :14: But I don't begrudge them if it makes them happy.
So, to answer your question directly:
- I think long-hose/bungied backup stands by itself as a valid gear configuration, independent of any other configuration choice other than the use of a full-time snorkel, and is appropriate for recreational divers. I think it's the best of the three.
- I don't think it requires much training. But I did do a good deal of reading about it's use, and I tend to learn easily from reading. Some people don't, I acknowledge that. I also bought and watched the 5thd-x "Essentials" DVD, which shows S-drills as well as finning techniques I'd like to try to learn. I agree it would be a mistake to strap it on some OW diver without explaining how it's supposed to be used. I'm sure PADI could create a specialty course, maybe an adventure dive option for AOW.