Mostly a big deal in dense cities, apparently. Figuring out where to put a great many of them when most of the space is taken up by other things. They're considering using parking spots for some of them, which has raised questions about the safety of the people accessing them. Other solutions and problems as well. Everywhere I have lived for the last 25 years has had these boxes, and they tend to build spots into new neighbourhoods to support them, but subdivisions aren't super dense, so I can see why cities might have challenges.