Snow Leopard introduced GCD, which was a HUGE new feature. It completely changed how we wrote async code. It just wasn't a huge user facing feature. Snow Leopa

Snow Leopard introduced GCD, which was a HUGE new feature. It completely changed how we wrote async code. It just wasn't a huge user facing feature. Snow Leopard also introduced the Mac App Store (in a point release), which was a user facing feature. I think the "zero new features" mostly meant "no flashy user facing features". It had a lot of new features for developers.