I think the reason for it is that tip-up just lays out better on the knife. The pivot needs to be centered, and unless you combine the clip connection and pivot, things get pretty messy for tip-down.
Personally, I prefer tip-up. But as O/P says, it is largely a matter of preference, so no sense in debating.
Here's how I look at this particular situation, though: There's fast rear-drive cars, fast front-drive cars and fast AWD cars. Most people agree that most purpose-built race cars are RWD... assuming RWD fits the sanctioning platform. Then there are also fast drivers. A fast driver in a slow car tends to beat a slow driver in a fast car.
Let's say I have a fast AWD car, and get a hare up about getting a Z06. But I'm skittish about the Z06 (no pun intended) because it's RWD... and I start having thoughts about converting the Z06 to AWD. That would be kind of a perversion. Really would be better to just learn to tune up the RWD and get it to rotate properly. Better to learn from the car than trying to beat it into a different form. Certainly at least better to start by trying to learn from the car.