Have any of you guys heard about bumps or potholes burping a tire on the road? That's what scares me. The flat could be swift and painful if it lost all air in seconds. In cross or mtb you aren't traveling as near the speed.
'Burping' is, I believe, a problem that happens almost exclusively to mountain bike tires and cross tires at very low pressures. For my application (Hutchinson tubeless tires on a converted road bike wheel), burping is not a concern whatsoever.
Yes it's because the pressure is higher than mountain bike tires. However, I have had some punctures on three separate occasions where they flat was sealed by the Stan's sealant, but not before a significant loss of pressure. In each instance, I simply kept riding and made it home fine. I could feel the tire being a bit squirrely, but nothing major and no bottoming-out on the rim.
When I got home from these flats, I have checked and seen that I was riding on 40 psi or even as little as 30 psi in one case. All of this is to say that in an emergency get-home scenario, I have run very low pressures for a short time and have had no 'burping'. It is nothing I would ever worry about.