that's bullshit... they'll be fine.

If you want a R compound that'll work ok for autocross, track events, and drag racing, the Toyo RA1 might be the tire for you. I've never had a set of tires that hooked up so well on launch. And once you get over the soft sidewall, and huge slip angles, they actually grip pretty well.

Also, they only get better with heat cycles, and a lot of road racers use them as rains, so that's not a huge issue as long as you're intelligent about it. Of course, they aren't quite as cheap as the Victoracers or Escta V700s, but they'll last longer.