That would penalize teams that run a more efficient fuel or engine. Since that would force them to carry more fuel than necessary. Also they wouldn’t catch Lewis’ skid block violation before the race. Since everyone gets new skid blocks before the race. The skid block is to catch people who violate the ride height requirement. The skid block will wear down during the race if it wears down too much the FIA knows that the car was too low. Ride height is hard to measure on a stationary car since downforce and suspension settings influence how low it gets during a race.