Again - more power to you, in terms of going for what you want to go for. I own Alien Love Secrets by Vai and have heard countless other tracks by him, and would argue that he has a great sense of melody in his phrasing, and typically uses a verse/chorus/verse type of structure in his instrumental work, with obvious departures for solos/bridges.
Put it this way: Is Dance the Night Away by Van Halen (youtube link; technique seen most prominently at 2:25 in) a memorable, charting hit because Eddie did harmonic tapping throughout the song - OR because it was a cool, catchy melody, that Eddie happened to have created in a cool way?