Not in this case, I don't think. If there's a way to break encryption, even in the smallest way, then it's not really encrypted, and calling it "good enough" does a disservice to people who actually expect it to be flawless.

Look at Lavabit, which was good but not perfect... everyone thought they were protected enough, and then the government came knocking and all of a sudden the little gotcha of "Well, Lavabit did have access to your data after all, even though they promised not to look and also be really careful about their encryption keys" is the crack they use to blow the entire thing open. (Though that was a pretty damn big crack, admittedly.)

If there's a way to break in, then it will be broken in to--and then "good enough" all of a sudden becomes "tragically and dangerously broken" for the kinds of people who trusted it the most: activists, whistleblowers, informants, political radicals, etc.