I used to think that way, until I turned around on stage and hit the headstock on my mic stand and saw my tuner explode into pieces. Prior to that I also had issues a few times trying to check tuning during song intros and couldn't get a reading because the sound of the other instruments vibrate my bass and therefore the tuner.I just can't get past the convenience of a clip on these days
Those issues prompted me to get a Sonic Research Turbo Tuner..... so much quicker and more accurate.