Even Apple doesn't support Safari on Cheetah! I'll hazard a guess that this might have to do with the success they've had in getting users to update off of old

Even Apple doesn't support Safari on Cheetah! I'll hazard a guess that this might have to do with the success they've had in getting users to update off of old versions. While you might be able to find a Tiger box out in the wild, I bet you'd never find someone running Cheetah. Doesn't over 60% of HTTP traffic come from XP boxes, in contrast?