People who already invested in an expensive traditional bike and want to have the option to add electric support to make trips easier and faster without having to deal with selling their current bike and buying an even more expensive e-bike.

There’s also the fact that many people have bike racks that are fine for traditional bikes but not the additional requirements necessary for some (most?) e-bikes such as weight and strength.

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Just because it doesn’t work for you and your specific worldview doesn’t mean others wouldn’t see value in it.