But at least right now they are only available in expensive bikes, so not something your average bike rider would buy anyways. I doubt you'll see many electronic shifters on people's commuter or city bikes.

Unless they come down in price and go mainstream, it's only two groups that buy them: actual athletes, where those marginal gains do make a difference and are worth the downsides, and enthusiasts with enough money to spare for their hobby. For the latter value or everyday practicability are probably less of a concern.