Does anyone actually run 120psi on their clinchers anyways? Depending on conditions I usually run something in the neighborhood of 95-105psi on clinchers and a) have very little trouble with flatting; and b) find the ride quality on top-level clinchers to be pretty good. And I'm no sprightly 130lb climber. (That said, the ride on tubeless might be better. I don't know.)
What I'd like to know: Can you go to lower PSI with road tubeless? Riders in Paris-Roubaix (admittedly extreme conditions) often run 60-75psi on tubulars. How good is the road tubeless technology these days? Can you run that without burping or rolling the tire?