twodeadpoets: +1 on using 'the right tool for the job". Many people use MTB's for touring (me included), and love them. For THEM it is the right tool. Others benefit from a 'proper' touring bike. THAT is their 'right tool'. Each person has to make up his/her mind what is right for THEM! And I am sometimes amused by people who think they know what works for me BETTER than I do!? (also sometimes annoyed).
Like armpits, everyone has a couple opinions, and everyone else think theirs stink! That said, if you ask for opinions, you will get a wide variety of them. I would advise using them as a guideline, NOT as a rule.