Maybe a little OT, but I simply don't see how you develop martial skills without hard sparring.
Some people have a lifestyle and/or profession which regularly provides them with real world violent encounters. I suspect that for many of those people the real world experience can be at least as effective as sparring for developing martial skill.
For the rest of us, I agree that sparring is necessary. I actually like a blend of light, moderate, and hard sparring as each brings something a little different to the table.