The concerns were more aimed at the fact that he believed it was doing something it wasn't. This is where spray sealants are great, because you can get a reasonable shine and beading without having to really touch the car, and therefore theoretically needing to clay bar (or accept that you're polishing the contaminants into the car, rather than directly removing).
I'm very much in the quick and easy detailing camp, I have neither the time nor the patience for more. Thus every 6 months...ok, once a year (do leap years count?), I give the car a run round with clay, throw on a layer of Dodo Juice NFS and then it makes do with a spray of Red Mist every so often. That's about as much I can stomach before wanting to throw in the towel.