At 71, with a bad knee and heart issues, I can no longer ride with the faster groups.
I found slower groups to ride with.
That being said, I have no issues with anyone riding an e-bike (or any bike) in a responsible manner. In fact, I have a friend who is finally retiring and moving to my area. As a retirement gift, I bought her a Trek Verve+ 4S so she can ride with us. I would much rather see someone getting some "assisted" exercise and being able to enjoy the activity than to be sitting on the couch.