I really don't understand on why you would have to spend 6- 8 hours rewashing after claying.. WHY? Polishing is only needed for swirl marks or scratches embedded in the clear coat- and that does actually remove a a small layer of clear coat so that should be as limited as possible and why the two coats of wax?
My method may not be for everyone, but it goes like this: wash, dry, polish (when/if finish becomes dull or compromised), apply/wipe off glaze 2x's, 2 coats of wax. The 2 coats of glaze and wax are to ensure I don't miss any spots. I only intend to glaze twice a year, maximum.
I have seen pictures on this forum of finishes that have been compromised by swirls and chatters enough so that I would use polish to remove, just to get a clean slate. I'm not sure how these occurred. I don't think claying would help since claying merely lifts exterior contaminants off the finish; it doesn't remove scratches. Polish or rubbing compound would probably have to be used, depending on how bad the scratches are. To me, that's completely unnecessary for a new(er) car if it was properly cared for from day 1.
Claying, from my experience, is just abrasive enough to screw up the finish if too much pressure is applied. Even with my 2001 Honda Accord, I've never had to clay as long as I wash and wax frequently. To me, and this is my personal experience only, it's too easy to scratch the finish by using too much pressure. Today's paints seem to be much softer than the good 'ol days, so I've had to re-adjust my style and learn to wipe on/off polish, glaze and wax, not rub. That may explain your point about the rust showing on some CR-Z's already: if you rub too hard with claying (or rubbing compound, which you'd almost surely need to use on a white car, again, from my past experience), you'll take away the clear coat, and if you don't protect with wax, you'll get rust.
I completely understand the arguments for claying but find it personally too risky and unnecessary as long as I wash and wax frequently, every couple of weeks. Although this may seem excessive, and probably doesn't take 6-8 hours including the glazing, it's my alone time away from the screaming children and woman