Yeah, it really isn't difficult to manually do it. My guess is that when they did it at first, as with most other things, they didn't fully understand what was going on. That's why we have things like monster frames and calibrated seconds. It's because people didn't have the entire picture. Now that we do, they're entirely unnecessary but since that's the way people learned them, it's difficult to get rid of them. Kinda like how we still call gas unleaded even though leaded doesn't exist anymore.