It would sound so much better, if they would use acoustic guitars live. A lot of musicians use acoustics with stands, so they don't have to let go the electric guitar and they can switch from acoustic to electric very quick. Some names that come to my mind are Yngwie Malmsteen and Dream Theater, altough last time I saw DT, John did use electric guitar with piazzo mic and sounded pretty good. I have one guitar with piazzo and the sound is good, but nothing beats real acoustic. Well, I use 7-string-gtrs and haven't found any 7-string acoustics yet...