superfly - you make some good points as well, especially in reference to cold days. The pro slicks are race compound tires which /supposedly/ don't necessarily need warmers but usually used with.
But I think the ambient conditions are frequently more telling than anything else. If its cold - all bets are off. It's going to be warm up the tires before doing anything crazy. However, with beginners you aren't talking knee down type of traction either. Most "beginners" are not at knee down type of angles. But you need to weigh the capability of the rider vs the tires he has on. With Pro slicks, that wouldn't be a good choice of tire regardless. Even on a warm day - they won't be able to ge that tire to its desired operating range. It's not the weather/temp at that stage, but the equipment on the bike.
I know when its 50 out at Laguna, I better have warm tires before I am at pace, whether thats laps around or tire warmers.
But I agree with you that its annoying to take a couple laps to warm the tires up if its cold outside. But at the same time, most beginners operating on OEM type of tires can be at 100% with those same times because they just aren't pushing it hard enough yet (in normal temperatures). Not in Canada
I think the biggest danger for beginners (and not sure ART/TPM) teach this, but almost every high performance school does - is that you crack/get on the throttle when you're steering input is in/complete. But NEVER add lean angle while you're adding throttle. . . Most beginners losing it is not a loss of traction because of temp, but a loss of traction because they added lean angle while adding the throttle and broke the tire loose, or they added brakes while still leaned over (just as bad as adding throttle).