With an ebike you can ride further. In some situations people want to go further.

When I get an ebike, I plan to buy a kit, and convert an existing bike. You can easily get replacement parts, and they will be much less expensive.

I plan to use a rear wheel geared hub, which can still be ridden without electric assist.

If you find any of the parts from a kit do not last long, you can replace them with parts from another manufacturer.