Right. I'm not saying I prefer acoustic bands --- sometimes it is just a gimmick, and sometimes it really doesn't work: I HATE Clapton's acoustic version of "Layla" with a passion! I was just clarifying why I think acoustic music can be seen as more honest. Doesn't mean it necessarily is, but I would definitely rather know that my chosen band/artiste(s) CAN play acoustic, that they're not limited by the tech they employ.
Can't see Art of Noise doing an acoustic set, can you?
But as for bands or artistes who profess (or whose fans do) that acoustic is more real than other music, I would not agree with that as a blanket statement. Certainly, sometimes banks of keyboards, screaming guitar solos (or intensive but restrained ones) can move me almost to tears, as can string sections, flute solos, and a whole lot more. It's not only acoustic music that moves me, and I don't consider it better than amplified music, for want of a better term. I think you need both to get the proper flavour of music, personally.
It can be interesting to hear a band who are not normally expected to use acoustic music, eg Metallica, in that setting, though sometimes, if they try too hard, something is lost within that effort. I guess you could also make the argument that people who ONLY play acoustic music can't handle electronic instruments, and maybe that makes them less musicians than those who can?
I don't know: there are so many sides to this argument. I do enjoy a good acoustic session, but they can get overlong and a bit boring,and sometimes you just want someone to rip off a power chord or do a few synth runs. Depends on your preferences I guess...