I'm probably old school, but to me a stripped down guitar/drums band is not a band. You're missing something crucial in the overall sonic spectrum. Technically of course it is a band, but its just incomplete. That's why I LOVE the power trio so much. It's the most basic stripped down band you can have that not only works, power trios actually kick ass best! And Muffs work fine in any band context, Pink Floyd had in its latter days basically a whole orchestra on stage, backing vocalists, extra guitars, keyboards, percussion, brass, and Gilmour never had any problems, you just need plenty of mids to cut through. Once you have that, any Muff can work. Then its only a matter of personal taste.