I say hi to those on ebikes, a lot I see are often elderly and whilst it might be wrong to generalise some of the ones I see don't look particularly fit but they are out on a bike so good on them. If ebikes get more people out riding then I don't see an issue.
Clearly I ride an ebike
but there is a huge difference between a legal "proper" one and the electric motorbikes
Mine simply means I can ride further and still be sure I can get home if my asthma crops up or my knees give way (again!)
Personally I would have a category for slightly disabled people who can ride but not walk well - to have ebikes for mobility if they wanted one instead of a mobility scooter
I am pretty sure my wife would have a basic ebike with a throttle whereas she will not have a scooter as she "is not at that point yet"
(which is exactly what her Mum used to say - which I am not mentioning!!!)