choddo: I have followed the tubeless posts on bicycle forums with some internist. The dirt cheap sealant as you put it adds a new set of problems to a simple machine. Clogged up valves and sometimes none functional bicycle pumps due to sealant getting in them. Dried up sealant, so it no longer plugs the holes. What happens when you get a hole that the sealant or even a plug can't clog. if you carried a tube and a tire boot in case of an emergency, could you clean out items that might cause a tube puncture when you are far enough from help it becomes a problem.

I have robust tires and carry a spare tube, tire boot and a patch kit. If I were to have a flat I no it is always going to be repairable. If someone would invent tubeless for bicycles that didn't need sealant. I might consider it. For now I will stick with the devil I know. I have for over four decades.