I would not hesitate to ride a brevet or two on my touring bike. But if I were buying a new bike for primarily randonneuring purposes, I don't think it would be a 'touring bike.' I'd have to look at the specifics, of course.
Any opinions on the Slasa Journeyman all-roaders (Claris and Sora drop bar models)
I would post links but I don't have enough forum mojo yet.