I have to respectfully disagree with that characterization. I put "cookie cutters" in quotes in my post because, yes, I think it is an oversimplification, and I believe some of those tracks clearly race better with the current generation of cars than others. However, I also don't think the common fatigue many feel regarding them is without merit, and I see quite clearly why casual fans have difficulty differentiating them.
There is an expectation of variety in a top level racing series that I don't think is misplaced. I believe the design trend that led to the proliferation of 1.5 mile D- and tri-shaped ovals in the '90s and '00s had less to do with what was believed to put on the best races, and more to do with what was viewed as the most commercially viable at the time. If there is an apt comparison to other sports to be made, I would argue that it's to the phase of mixed-use football / baseball combo stadiums in the '60s and '70s that with the benefit of hindsight became unpopular due to their lack of character. I don't mean to say that some of the "cookie cutters" aren't very fine race tracks and among the best on the circuit. It's the oversaturation of these broadly similar tracks that is the problem. Replace your least favorite two with something strikingly different, and I think you've improved the schedule in a meaningful way to the bulk of both casual and core fans.