There is so much more info on the speedtape
Some people like ASI's because they are simple to read while others love the goodies associated with a speed tape. There is a wealth of information on the speed tape. But as a competent pilot do you really need to be flooded with all that info? Nothing wrong with an ASI - thousands of pilots have used them since WW1. At least an ASI needle doesn't bounce around in slight turbulence like a speed tape.