Thanks! If bp/w is highly recommended for drysuit diving in colder waters, which we do have here, why wouldn't beginners use them as well? What we don't here get is why someone would assume a skill level just by seeing a piece of dive gear, instead of actually asking.
Money and habits. In the UK clubs (BSAC) favour Buddy Commando because it's indestructible as club gear and out of (bad) habit. Commercial shops - with few exceptions - use jackets because jackets are far easier to setup for large classes, bring higher margins, look less intimidating to beginners and are better at preventing poor swimmers from panicking on the surface. Nobody cares about the actual diving bit.
It's difficult to upsell on a piece of steel with few holes, a simple webbing and a simple bladder/wing. That's also the reason why you see wings with comfort harnesses, weight pockets and other "stuff" that's quite unnecessary.
People assume skill levels based on mental shortcuts and it's very subconscious. Brand new gear, snorkel attached to a mask? Probably a newbie, watch out. Drysuit, backplate & wing, maybe even in decent trim? Probably someone who thinks about their diving a bit more, maybe I don't need to explain everything. It's really deceiving.
I realised how big a problem it is when I started diving a rebreather - lots of divers would look up to me and expect me to lead dives and solve their problems, because my gear looked very advanced, so I must have been very experienced. A bit a of a problem when you have less than 10 dives on the thing

. I had to be very upfront about what to expect.
Thanks! We think we can live with the adjusting and setup, to us that does make a lot more sense. If you also can get the shoulder strap buckles it would also make donning/doffing easier. Are there other methods to do the webbing? How do we find the right lift capacity for use with a steel tank?
You might be fine with a single piece. Worst case you can later add a plastic buckle to one shoulder.
I used a 38 pounds / 17 kg wing with single 15 litres steel cylinder and I feel that it was about right for cold water as you need quite a lot of lead.