I admit to being a snob when it comes to bikes - I feel a bike should be powered by muscles. When I lived in NYC I was always peeved when someone on an electric assist bike passed me. Mostly the individuals were food delivery riders. They were just earning a living, not out to piss anyone off.
Is my bias justified? No, it's just a personal feeling that I should probably get over. If people want to get around on two wheels without pedaling they have every right to. People might also have loads to carry that might not be easy with just their muscles. There are lots of good reasons for electric assist bike usage, however I still take on a curmudgeon mentality when I run into them on the road.
Maybe I will get over my feeling if people send along electric assist bike hacks, like reader Steve did. Text, links, and pictures below are credited to Steve. If you have electric assist bike hacks, feel free to send them along - I won't let my bias keep me from posting.
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I have a bike I built to carry my self and my daughter cargo. The updated version is here -

- and the original can be found here.

Both versions are electric assist with the original being a friction drive and the updated version a rear hub motor.