How someone wants their gearing set up will depend on the type of touring they plan to do. For lightly loaded fast tours, road gears should be fine.
For me, I plan to do self contained fully loaded touring towing a trailer, so I want pretty low gears, which are most easily achieved by using MTB components. As a 60+ rider, I no longer qualify as a "young, fit, racer dude" so I have to make my setup work for ME. You need to evaluate the type of touring you want to do, and use what works for you.