Open a dive shop and they will sell you service kits. And if you are that good you local shop should be will to sell you service kit and parts, and if you have been trained you should be able to get parts from who trained you.
I can walk into five different shop and get serice kit and parts for any major brand no problem.
I want service kits because I go diving in places where
there are no supply chains. Somehow, even in these remote dive locations, if I have a service kit, the local barefoot DM always volunteers to do the work on a log that serves as a workbench/hitching post for a donkey.
Usually I give him a 'pocket-tool' just to say thanks and so he doesn't have to finagle it with that rusty screwdriver. He usually still has and uses a selection of rocks of certain shapes that are used for whacking stuff. The reg is serviced and operational before the next dive, and he has a collection of some serviceable used parts (plus a shiny new pocket tool), so it's a win-win for everyone.
If one of our party members insist on bringing his Poseidon regs, they're smart enough to bring their own kits. If you have a Sherwood, they're universally serviceable and interchange parts can be found in even the most remote diving operation or in a pinch you could cobble them out of a dead BIC lighter and a bicycle inner tube.
I can't get parts from the guy who trained me because he died at age 87 ~ let's face facts here, a regulator is a regulator. It isn't rocket surgery. But there are 100 spurious arguments to the contrary.
I appreciate the need for an LDS to withhold parts form consumers to protect profit margins, unfortunately they hide behind the lame excuse of liability from non-certified people performing technical tasks.
This is what the Glock pistol company does, but they make no such claims as to fear of increased liability. You just are a yearly certified Glock armorer, or you can not get the parts. Period, no explanation given or implied. It protects the supply chain.
All of my above silly rambling aside,
the dive industry already knows exactly what the consumer "wants", and they are in no uncertain terms giving it to us.
They know the majority of new gear buyers are
hot for
shiny metal objects with serial numbers and circuit boards.
To this last available buying market, reliance upon technology is in their DNA. Thus, technology is what they offer. Titanium underwear and more.
They cater to the lowest common denominator which they themselves have created. Consider: Are any of the major BCD suppliers offering a viable and competitive BPW alternative? Why are the major manufacturers offering a string of functionally identical regulators at a preposterously wide price spread?