Yeah, as I said - back in the day when you geared your car to dump just as it crosses the finish line it was more important. These days if I want to go faster then I go up a pinion. If I want to get more punch then I go down one. Batteries last all day anyway so as long as the motor doesn't burn out I'm good to go!
Useful if you're doing a one-time conversion from say 32dp to 64dp I suppose, and you want to start with as close to what you got already!