You may be right. My own experience with tire rotation says that other tire maintenance is perhaps more important, however. Case in point is my previous vehicle which was a 2004 GMC Envoy SLT. It came equipped with Michelin P245/65R17 Cross Terrain tires. As with every vehicle I've owned over the past 50 years, I NEVER rotated them. I did however strictly maintain tire pressure and wheel alignment. These original tires yielded 82K miles over 4 years before being replaced with another set of the same tires.
Now obviously these are two different types of vehicles and I sure as hell drive the Z more aggressively than I did my truck so I don't disagree that I may not get 60K miles on the new "shoes". OTOH, I'm not nearly as pessimistic as you are about the end result. After all, I got 25K miles from those soft summer performance Yokohamas. Like I said originally, time will tell.
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