Well that's the thing, isn't it? So many bands use an element of programmed or recorded accompaniment live these days. If you listen to someone like Kasabian, their whole sound revolves around electronic/dance beats. And I can't even imagine what Coldplay would sound like without all the synths and strings. Even traditional guitar/bass/drum bands are often playing along to a click so they can get samples/loops/lights/video all synced up. The very notion of a dance or electronic band playing "live" - whether it's Goldfrapp, The Pet Shop Boys, The Prodigy or whatever - has always been a joke, it's basically karaoke (at best). Was Dolly Parton miming? Probably a bit of both. Large portions of live singing, but with pre-recorded backing vocals plus a few high notes and stuff. It's just the way things are these days. And as mainstream audiences have become accustomed to a polished product, it becomes self propogating.