Lewn777 wrote:All seems a bit half-baked.
Have you actually ridden a disk bike and/or tubeless? I have a few years experience of both and I assure you your objections are groundless. Disk aren't constantly dragging unless they're really badly set up - same as rim brakes! Road tubeless works just fine, you get a lovely ride quality and a big improvement in flat protection. If high pressure worries you then ride 28mm at 60psi or whatever - you will not be 0.1kph slower.
Road disc is on the way to becoming the mainstream.
I own multiple bikes in two countries. Been using tubeless and disk for brakes for years, not only road, but motorcycle and MTB. So your assertion that I simply don't know about the latest and greatest tech is incorrect. My complaints are from first hand experience, in fact you sound like an inexperienced rider or new adopter itching to convince yourself and everyone else that you will or have spent your money wisely. I know you'll then counter with 'but you didn't do it right'. Trust me, I've set up more than 30 tubeless tires, and installed, bled and trued tens of hydraulic brake systems.
Current tubeless tires and disk brakes aren't that popular with most road cyclists because they quite simply don't offer that much. Or you get something but there's a cost, financial, extra weight and complication. Not everyone wants that, and forcing the issue through like the cycle industry did with MTB 27.5 tires sucks.
Tubeless ready systems for road don't work that well because of non-standardised tires and rims. Leaky tape, leaky valves and sealant that doesn't seal until it gets to 40psi unless you get orange sealant. Fast road tires like Schwalbe Pro One puncture constantly and offer no improvement in handling over tires like the Continental GP4000S2, and offer nothing much more in rolling resistance. Tires that are tougher have sidewall issues and pick up small cuts easily. If your favourite tubed tire gets a puncture every 1000kms or more then why go to the hassle of tubeless? It's certainly not a no-brainer on road cycles like it is on MTB and motorcycle.
I would agree that eventually when the industry get things right disk brakes might become universal, and tubeless become more popular, but not quite yet.