the reason is that many people trying to get the four extra bonus from training.A reason for not full condition
But if you didn't have the time to do some practice early in the morning
or you don't have X2 bonus available (so need 4-5-6 sets)
or not enough players
then maybe you cannot have full condition for a game.
Personally I prefer to start with all four bonus at max 10% and 85-90% condition
(if cannot have all)