The Hot start gives you a wider range of starting conditions for your bike and it's jetting. That way your bike does not have to be dialed in perfectly for that day's riding conditions. (Is your motor warm, or is it boiling coolant hot? Is it the first start of the day, or are you trying to start it after you stalled it going through a corner and just got done bouncing your motor off of the rev-limiter? Did you just crash and has your bike been lying on it's side for 2 minutes? Are you riding in 60 degree weather with 80% humidity, or is it the very next day, and now it's 90 degree weather with 10% humidity?) I think the race teams can get away with removing there hot start because they know exactly what the proper jetting specs are going to be before they start the race. They know what the weather is, how long the race is going to be, who's racing the bike, and have had several practice session to set the bike up properly.