Very interesting stuff, and clearly tire choice matters much more at the sharp end of expert/advanced no doubt. I didn't mean to start a tire preference thread, but the question of how much a tire or compound helps laptimes is pretty interesting. For my trackday riding and pace, it matters very little. I ran the Dunlop Q5 for 3 seasons in novice, and I had no interest in running slicks at that level. The Q5 was great, works in dry and wet, doesn't need warmers, way more grip than I ever needed. I did ATP, got some coaching, practiced and found 25 seconds last summer at Pitt, all on the Q5 (oh yeah I also got a much quicker bike

Got bumped to I group.
I could probably stay on the Q5 and be fine at intermediate pace, but I also like to learn and experiment. I believe trying different tires will help me develop a better feel for my bike and different conditions. So I'm getting into slicks with warmers and want to do it in a safe, smart way. First thing I did was ask the tire guy and he popped a set on for me at the end of last season. Told me what pressures to run, etc. Felt like a good start. No pushing for laptimes, I just got some practice using the warmers and a feel for the tires.
A trackday oriented slick tire seems like a good entry point to the world of slicks. That's why the Metzeler TD tire seemed interesting. It apparently offers good grip, consistent performance, durability and convenience of working in a wide temperature window. Only one way to find out!