I ride an ebike for health improvement and exercise. I'm 70 years old and just retired. I lost 30 lbs riding and am now down to about 250. I put a BionX system on a Trek Verve 4 and love it. I can't stay off the damn thing! There is no way I could do 30+ miles a day on any bike that didn't have electric assist. I know because I've tried it. Turning into the wind on the back half of a 30 mile ride without assist is not fun at my age.
From a health standpoint, my doctor was surprised to discover (as was I) that my atrial fibrillation has gone away as a result of the bike riding I've been doing. This has been a fantastic benefit. Interestingly, I was off the bike for over a month due to a hip injury (not bike related) and the afib came back. Once I got back on the bike for a month, it disappeared again. The doctor said to keep doing what I'm doing. You can be sure I will!