Your commute is 30 mins by bike, it not everyone’s is… if someone’s commute could be halved from 60 mins to 30 mins by using an e-bike, you’d get all those people in that radius who could bike instead of drive.
Some people can’t ride 30 mins twice a day… 5 days a week… if an e-bike let people go every day, that’s just more people advocating for bicycles/bike paths/hard barriers/infra for everyone.
Also, just making it easier to get into it. People who aren’t fit who wouldn’t even consider a traditional bicycle might consider this. It’s easy and a certain portion of people would eventually get multiple bikes for different purpose.
I used to bike 45 mins to work (7 miles) - we had secure bike storage, showers and a locker room for bike stuff, but again… not everyone has that. If you were less sweaty and gross after biking (that is… less exertion on an ebike), more people would do it.