That is till this day(12 years since I last set foot on a skateboard) the most illogical thing. Especially when combined with board slides which were also not apparent from the start(for years on I called front side board slide back side) and from a logical perspective the lip slide names made a lot more sense. That said, I never figured out how to classify nollie/fakie board and lip slides front or back. As far as experience I also never understood why were hard flips called hard(I learned how to do them in less than 15 minutes after I first decided to give them a go).