What you're saying makes a lot of sense to me. I think the challenging part of this defense against the flop check-raise is finding the right balance of checks with flops you like vs. flops you don't like. You have to keep your opponent off-balance enough that he doesn't interpret your check as a liscense to bet the turn and pick up the pot. But at the same time, you don't want to check too many good flops or you will not be getting enough value out of your good hands/flops. I think this delicate balance that needs to be maintained is a good indicator of the strength of the flop check-raise. That doesn't mean it can't be combatted but it takes an opponent with very good post-flop skills (like Negreanu) to do it.