I think it has to do with whether or not you can judge the length of the ball. If you move your feet well to get to the pitch of the ball, you will connect more often than not. But if you simply get stuck on the crease (don’t move your feet well, aka left-handed Sehwag), are late or indecisive or simply hang your bat out at the last minute to a ball moving away, then you will be in trouble