I can't say I'm a fan of stripping everything down to just a vocal and a guitar. I'm an advocate of musical layers, movements etc. I don't see the technical and artistic difficulty in stripping everything down and simply just writing two seperate parts for an entire album. The true challenge and beauty in music, to me at least, is in creating texture, huge soundscapes, movements using as many things at your disposal as possible.
I often find that even Vox, Guitar, Bass, Keys, Drums are way too simple. So many things have already been done with that assortment of instruments.