Why shouldn't you fit a tube to a tubeless tire?

Fitting a tube to a tubeless tire can lead to issues such as improper fit, as tubeless tires are designed without a traditional inner tube and may not hold the tube securely. This can result in pinch flats, as the tube can get pinched between the tire and the rim during inflation or riding. Additionally, the tire's bead may not seat properly, compromising safety and performance. Overall, it's best to use the appropriate tire system designed for your specific setup.