.... and most people that are new to sew-ups are put off by the work it takes to mount and repair them. The fact that 99% of the pros are riding them makes no difference either, because they have mechanics to do all the dirty work. I don't mind the scraping, gluing, stretching, mounting, repairing of tubulars. Since I was brought up on sew-ups, I find the extra work put into caring for them to be sort of meditative and calming, but that could be said for any work I do on the bike.
Tubless technology has been trying to get on the road for over ten years now to no avail. If they were so great as some people claim, the whole peloton would be using them. Fact of the matter is that tubeless tires and rims are heavier than clinchers and tubulars, this is why you only see maybe one or two guys testing them in the pro ranks year after year with no gain in numbers. Tubeless technology was originally created for the MTB scene in an effort to alleviate pinch flats, which is a rare occurrence on the road.
IMHO, on the road, nothing beats the convenience and ease of repair of riding clinchers for training, and the unbelievably plush ride quality at high pressures and safety aspects of tubulars for racing.