A lot of people also aren't young and able bodies enough to ride such a thing.

People who aren't able bodied already ride power chairs onto the bus.

And there's a lot of in-betweeners who don't need a wheelchair but also can't really ride an electric skateboard. Like, just about everyone over the age of 50.

(Yes yes, I'm sure you have an anecdote about a 51 year old you know who rides an electric skateboard all the time, but broadly speaking...)