Beyond being able to handle almost arbitrary orientations and alignment between the car and charger, Elon is probably planning on reusing this tech at SpaceX for docking or other purposes (just like they share battery tech).
He's a pro at coming up with "synergies" between his companies.
TBF, for space technology it seems far too complicated; you'll want less components, not more. Less components means there's less chance of failure and less weight. I mean I'm pretty sure each segment is motorized or has cables running to it with separate motors.
While something bound for space needs tons of testing, loads of refinement, and to be the absolute minimum weight possible, the worst that could happen with this in your garage is... what? It can't find the socket so it beeps angrily at you until you move the car closer.
So, it might be partway through it's development cycle for Space X, but good enough right now for use here on earth.
He's a pro at coming up with "synergies" between his companies.