1 - Nup
2 - Nup
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4 - Nup
I think I've worked out your problems - a) you're on the Gold Coast and b) you're German DNA expects efficiency but the Aussie DNA expects "oh well **** happens"
Seriously
@clownfishsydney is right - diving is dying in Aus is dying and the bricks and mortar shop is where people go to get certified, do a course (especially holiday makers in you're locale) buy an entire set of shiny new kit...which appears on gumtree a few months later. But year after year, I see mostly the same staff, the same customers and all but one shop sadly seems to change ownership every few years. I'm down to two easily accessible shops and one of those has been in the same hands for the last quarter of a century that I know of (shoutout to Callum and the team at Dolphin) the other used to have three branches but is down to one. Unless the guy who appears to be the owner and loves Uepi as much as I do I've noticed the younger sales staff change a bit but that may just be due to random timing when I drop in.
I do use Adreno a lot, but only for "bits n pieces" and I've been using the same online guy in VIC for prescription masks for the last decade.
What Adreno can't do even though I've rang them and they've been awesomely helpful in letting me know exactly what time shipping leaves and if they can get me say a torch before I Fly out on a dive trip in 4 days is...let me try things on before I buy them. The other shop I frequent with Uepi guy went way over and above when I suddenly realized I needed a new Wetsuit before heading on a month trip to Africa even though there was a bunch of public holidays and weekends. I'd done similar a few years before a couple of days before doing a LOB when I bought the last BCD. After trying on the Scubapro I thought I wanted I hated it even though it was in my size, the young girl serving me bought in every wetsuit in my size they had. Nothing else fitted so she bought in a aqualung a size too big and said she would track down every dwarf sized Aqualung in Aus for me. They rang 3 days later and she had managed to get a size 4 and a size 6 from two different states flown across so I left Aus looking somewhat respectable. I appreciated that as much as I appreciate honesty. We tried every single BPW they stocked or could get hold of easily in their store and compared dimensions on manufacturers websites to find whatever combination my hip bones were an issue. So custom or ordering a then new option on a fingers crossed basis from Singapore were the only options and realistically neither were going to happen before I left on another trip. There was no pressure sales this will be fine stuff. They know I've been going there a decade why would they lose my very infrequent business by trying to palm gear off that a new diver might think is just a part of uncomfortable scuba gear?
The industry's small. I think every shop knows I'm a solo traveler and not interested in trips nor am I interested in most courses so I've never had any issues there.
Air fills? I have my own tanks and lately tbh a friend who's a techie with great gas blending skills with compressor and the typical engineering mindset has begrudgingly been doing my air fills.
My only complaint with dive shops is Years ago I got called a "Dive Traitor" because until this year I rarely ever did any diving here and didn't rent tanks so I contributed nothing to the local industry. Sorry for preferring PNG to rockingham wreck trail.