I think this notion is one of the biggest myths of ScubaBoard. It's the same reason that is often given to support buying a BP/W for recreational single tank diving.
In reality, I think the vast majority of people who go tech (and this is just my own anecdotal and very limited perspective) never realize the purported benefit being described here.
If they go tech, they end up buying new regs. They don't just buy a 1st stage and some hoses and repurpose their existing single tank reg set.
If they go tech, they may start off just buying a new wing and using their existing BP and harness. But, it doesn't take long before they end up with a second BP and harness.
I'm not saying these things are true for every single person who goes into tech. It just seems like it does apply to the vast majority.
Anyway, personally I would not steer anyone to or away from a particular reg set for single tank, recreational diving based on any possible plan for tech diving in the future.
In this particular case, I would (again) say that either one of the OP's options would work fine. *I* would buy the Mk 25/S600 if it's less money. Otherwise, the DST/XTX50. And I would get a matching 2nd stage to whatever I bought, to use as the octo.
Agree 100% (this is starting to get scary )
The amount of misinformation concerning this matter on SB is piled high and deep indeed. Equipment for technical diving is on one side of the storage room and the equipment for recreational diving is on the other side of the room and the two don't get mixed at all! Regulators, BC's etc. used for recreational diving don't get recycled for technical diving and the other way around is just the same.
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