I can see what you're saying Ed, but I'm going to totally disagree with you!
Yes the classics are largely raced on low pro 'handbuilt' wheels, but I'll assume our OP isn't riding pave at 35mph with a very strong likelihood of smashing wheels!
'Factory' wheels are still built by hand, as above. FFWD wheels are all built by some fellow called 'Zoran' or sommat. Let's be honest, if there was a genuine advantage to running some DA hubs on Open Pros then it would be more common place in conventional road races. There's enough teams out there running Mavic, FFWD, Roval, Bontrager wheels etc that it's obviously not a problem for them!
As for the spares, save for Mavic, the rest of those brands use conventional spokes anyway, rather negating that argument!