+1
Motorcycle racing is a different kettle of fish, but the same principles apply. I have race tyres with tread (GP rated) which I will throw away after a practice session and a race ... purely because they've "gone off" and lose their grip even with tread left. When I ran slicks (for Supersport) it was the same story. But my road bikes get 6,000kms out of their rubber instead of a few hundred kms. Different environments call for different tyre treads, compounds and profiles.
Scrutineers at a race track will not permit you on track with tyres with low tread/worn rubber ... because the best your tyre will perform is between new to about a few hundred kms old. I've been behind a racer on worn tyres and been covered in bits of rubber, because he had no idea his tyre was disintergrating itself, even in a straight line, at speeds above 160 kph. He crashed later that day.
Slicks are purely bred and manufactured for high grip in race conditions ... does not mean a "bald" street tyre performs the same.
Race motorbikes, then you'll learn how vital tyres are and the differences between brands, treads, compounds, profiles, tyre pressures etc. I take the rubber on my cars as serious as the rubber on my bikes.