Atticus once bubbled...
Was the problem with the student divers not being comfortable with the long hose arrangement possibly due to how it was presented? The words tech, trimix, deco need not enter into the discussion at all. It's simply another way to donate in an OOA situation, which applies to any type of diving.
It's funny how some students react, though. He does have a point that they can be initially uncomfortable (afterall they've never seen anything like it before) but that goes away almost immediately if you take the time to show it to them and talk about it.
I wear double first stages and a longhose/bungie-octo during the OW dives too. When I took my DM training we actually took the time to do some scenarios (other DM's playing students) specifically about how to answer questions from OW students about my rig and it was a good thing too because I probably would have had trouble dealing with the questions initially. This is the problem that Jason and his instructor are having. They haven't worked on a good answer to the questions yet. (I mean aside from the breakdown in trust that is....)
When asked about the long hose I just answer that I borrowed the idea from cave divers and I use it because I find it more comfortable with my drysuit. OW students don't understand diving in caves and they don't have experience with drysuits or long hoses for the most part and to date every single one of them accepts this answer. "More comfortable" is something everyone can relate to and it's not intimiating like saying "safer" "better" "easier" "TECH" "Do it RIGHT" or whatever.
The dual 1sts are harder to explain. The real reason I have it is to spread the load because I dive in freezing water in the winter and I don't want freeflows (or when I get one I want to be able to turn off the reg). This is hard to explain openly without making (some) students afraid of freeflows. Or raising doubts about their "normal" configuration.
I explain away the dual first stages with a combination of white lies --
"I borrowed that from cave divers too but actually it's over-kill and you don't need it".... (come to think of it this might be the truth...

)
joking
"this is Peter's (the instructor's) reg and he's always forgetting it so I carry it for him" or
"I breathe heavily and I need two"
and deflection
"oh, that's just part of the package ....SOOO let's take a look and see if you're all ready to go......"
(if anyone has a better idea, let's hear it)
Sure, if you don't explain it to them or you talk about "risks" and act all "macho" then it will make some students uncomfortable. But if you're not secretive or "macho" about then they only ask once, they accept the answer and by the second dive they're used to seeing it and it quickly becomes normal to them.
For example. Jason could explain his entire DIR kit by saying what 'CD in Chigago" said. "I bought it 'cause it looks cool". (hey! just thought of another way to explain my 1st stages...) Easy to understand. Everyone knows about fashion statements. There's nothing intimidating about that and if you add a joke to that like "Even under water you gotta dress for success" or whatever then they'll just accept the answer and move on. It's all about giving them a handle to understand it without the focus on "risk" or talking about intimidating things like "tech" diving or using words like "better" ....
R..