Actually a torque 20-35 foot-pounds (40-50 N-m are the vendoor specs) is really quite tight as you can discover if you use a torque wrench to tighten the lockring. I've seen lockrings spontaneously loosen and let the cassette rattle if they aren't tightened sufficiently. "Snug" won't do.
Sheldon is correct but he was comparing the removal torque for a cassette to that for a freewheel which can be screwed on VERY tight and require a big wrench and a lot of force to remove.