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You're kinda barking, I have seen numerous audaxers with hydraulics, even tubular 23mm tyres.
It's almost rare to have a crash or system failure to leave you stranded, my touring bike have full hydraulic and still find them more reliable than cable pull because of the lack of adjusting needed.
Like Howard said, you have to be really unlucky for that to happen, I can comfortably says that other part on your bike is more likely to leave you stranded than hydraulic, says a cracked tube (didn't stop someone doing the Bryan Chapman Memorial).
I tried to UTFS but haven't found anything conclusive, so here goes:
I know hydraulics are much more effective, but I'm not keen on a system that I can't fix if I'm in the middle of nowhere touring or on an audax. So I'm considering asking a bike manufacturer to swap out their standard Shimano hydraulics for Spyres (which they're happy to do). I'm not barking, am I?