I think you're being needlessly judgy, ebikes are great and it's never been about whether you "need" one or not.

They're faster than regular bikes, allowing you to cover a larger distance in the same amount of time, especially if you're fit. They're very fun to ride in general, and they can take some of the misery out of climbing hills or otherwise challenging/tedious parts of your commute. Cargo ebikes can carry a decent amount of stuff and even one or two small passengers in some cases, and in other cases they can replace your need for a car (like quickly getting to a store for something small). And they give you the ability to balance exercise vs convenience as the situation or your personalty demands (you get to decide how much work your body does and how much the motor does).

Finally, ebikes open the door for people to get into using active transportation instead of cars for people who normally wouldn't want to, whether they need help because of fitness, want help because of living in a hilly environment, or because they just want to get from point A to B in a reasonable amount of time. Riding my ebike in an urban environment, I find that I can actually get around just as fast as in a car, if not faster due to traffic.

Because I'm not super fit and live in a very unforgiving and hilly American neighborhood (where I also have to ride on curvy roads where people drive too damn fast) I would have never ever considered getting a regular bike. I'm now riding a bike somewhat regularly, getting a bit of exercise (or not, depending on the circumstances), and having a great time riding on roads, bike lanes, sidewalks, through parks (at a reasonable speed for pedestrians), etc.

Yes, they're more expensive than a regular bike.
Yes, they're heavier than a regular bike.
Yes, having to worry about battery charge is inconvenient.
Yes, it can be dangerous to ride any bike at >20mph.

But as the old saying goes "don't knock it until you try it". Even if you think you're a cycling purist, I recommend at least giving ebikes a try before judging others for using them. I think if you did you'd find that ebikes are an ally of and complement to normal bikes, and just like an electric guitar amplifies your strings, ebikes are amplifying your legs and not rendering them obsolete.