The Buzz is a van, it’s meant to be big so you can put stuff in it. It’s actually too small for my liking as it’s too low to fit my dirt bike in without a struggle and too short for a 1200x2400 sheet of ply/metal/whatever (my Transporter fits both of these nicely though).
Nowhere in the movie is that even hinted at.
The opening scene tells the viewer the decline in intelligence in the future is due to the less educated/intelligent reproducing more, that’s getting rather close to eugenics.
I don’t think this was intended as more than just a handwave argument as an explanation for the plot necessary premise of people being stupid in the future (i.e. it’s not something to get offended over) but it is mentioned nonetheless.
If you’re rich enough to have a house where you can charge at home, sure. If you’re in an apartment you’re probably out of luck there.