This thread has turned into a recumbents good/recumbents bad thing. Nothing wrong with that!
If I was young and fit I think would audax faster than pretty much anyone anyone else on my current recumbent - it is simply the fastest bike of any kind on a level, good surface I have ridden in 30 years. (Yes it is slow uphill).
(Wonder whether to mention Tiger romping up Hackpen Hill on the 2007 Marlborough Connection at a pace which surprised many)
Other people (not me 'bent fans) have also stated that in their opinions ( based on experience)
Recumbents are:
Well, they can be. I've seen sub-7 kg machines from Peter Groeneveld and the Razz-Fazz lads, though admittedly they're not the sort of machine you'd want to use on a hilly ride. But 9-10 kg seems doable.
No more so than most upright bikes, unless one goes in for one of those old-fashioned LWB things, which are thankfully almost extinct on this side of the Big Ditch
- expensive for what they are
Oh, I dunno, you can easily pay over three grand for a Dura-Ace equipped upright as well
In >twenty-six years of recumbent riding, the only time I've suffered from any problems was riding a trike without a rear mudguard. Cold water over the top of the seat and straight down the neck
- difficult to ride uphill due to not being able to honk
ITYM "slower uphill due to lardiness". You won't catch me resorting to undignified behavoiur like that on an upright unless it's absolutely unavoidable
- more likely to attract youths throwing stones
Not in my experience.
- difficult to get spare parts for
Not much more so than, for example, a Moulton or and Airnimal and there are plenty of them doing Audax.