At the end of your day, it is what gives you a lift!
You can't park many light aircraft outside - ie Piper Cub, Tiger Moth, Condor - because they are wood and fabric.
You can park weightshifts outside, you just have to pop the wing off. But usually, while you can buy an airworthy weightshift for 1500, if you have a 10k to 25k aircraft, you want it parked inside.
Motorbikes have different controls from cars - you even turn the opposite way with the handlebars! - and people don't have too much trouble.
I could go on, many have already.
It is horses for courses - and ironically, the first two microlights to be flown around the world were weightshifts!
XA