A few things have gone unmentioned. They don't seem to weigh much but a tube in a tubeless tire is unneccessary unsprung weight resulting in a rougher ride. Tubes in tubeless tires can overheat the tires. A warm tire grips better than a cold one (within the tire's operating temp range). A hot front tire will get "greasy". Not literally but it will get slippery to the point of "washing out" resulting in a low-side crash. A tube adds thickness to a tubeless' supple sidewall and prevents the it from placing its tread on the road surface as designed.