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christianweber:what is a "ostensible question"
Nemrod:"an octopus reg when you solo, you always have a back up for your self."
An octapus is not backup for anything, it is not redundant nor is it independent. An octapus has only one purpose, to supply an out of air BUDDY with redundancy, a circumstance not possible if solo being as you would have no buddy and therefore no need for an octapus on short hose, middle hose or seven foot long hose. However, a set of independent doubles, a single with buddy bottle, the interesting side mount rig all have "backup", I suppose an isolation manifolded double set also, but your seven foot long octapus does not provide any back up and therefore is not an optimum rig for solo diving no matter how great it is for buddy diving in caves.
N
TomP:So, any debate about the value of a long hose should be in the context of a primary reg. In that context the advantages of streamlining, comfort, etc. are all still valid.
TomP:Nem,
At the risk of invoking deja vu all over again, I think you may be combining two separate notions.
I agree 100% with your characterization of what an octopus is, and that an octopus is of no benefit to the solo diver. But, in the configs i've seen the long hose is used on the primary regulator. I'm not DIR but I did check the GUE site and it seems the long hose is primary in a DIR config as well.
So, any debate about the value of a long hose should be in the context of a primary reg. In that context the advantages of streamlining, comfort, etc. are all still valid.