E-bikes and indeed bikes in general are mobility devices. About half the U.S. population is unable to drive a car for some reason: age too old or young, disability, licensure, or economic. The majority of disabled people who cannot operate a car can operate a bicycle instead. Bicycling is much more inclusive than driving.
Not parent poster but I can imagine for one thing that electric cycling is an excellent way for frail people to keep their strenght while still having a practical way to go about their business.
For people who have had accidents it’s proably also a good physical therapy tool.