What do you think about Ti frames for adventure touring? Do you have a persuasion to one type of material or another for this application?
I bet you could tour your heart out on a Moots and love it. I'd love to just pedal along and look at it! I just think they're so beautifully refined for performance, that I
personally would hate seeing it lumber along under a load. Especially a load requiring racks, panniers, etc. If that touring were "ultra-light" touring with limited weight, no racks, no panniers, a frame bag, a seat bag and a pack, then HECK YES! Then you could rail along and tap into that refined performance. These are just
my opinions which I encourage you to hold as suspect.

As a daily rider and a platform for
ultra-light touring, that Moots would be the bomb-digitty as those whacky kids say.
Regarding materials, I think any material will do fine for touring. The more I ride steel, the more like the feel of it. Ti appeals to me for ultra-light touring because it has a similar feel to steel, but the raw finish of Ti would be easy to maintain. The weight savings would be minimal. The one inherent challenge builders face with Ti is the same thing that draws builders to Ti - FLEX. I think getting a Ti bike to feel fun and lively under load for touring and then unloaded for daily riding would be tough. If you over build it to endure 50 pounds of gear, it won't have that silky feel when you're out on your local trail.
That said, material alone means nothing. It's how the material is used that counts. That even goes for bamboo!