It's just a different use case is all. There is certainly a market for it proven by other folks. My point here is I'd like to see Exo apply their design skills to this market because I think they'd do very well and come up with something I'd like to buy.
As far as comfort goes, crawling around on the ground and trying to look up with a tall frame sucks. I'd like a shorter frame in hunt mode and make a quick adjustment to taller frame in haul mode. My SG doesn't have that. I know the K3 does and some others do. That's a great feature.
What you describe you want sounds like a kuiu venture or divide pack. Take a look at those.