I doubt “no one” does. You may see a majority of bikers using the bike lanes, but anytime there’s a sidewalk and the biker feels like they can’t keep up with the flow of traffic in that lane they move to the sidewalk.

I hope you enjoy your biking, this mostly idealism on my part. I am actually a bigger supporter of increasing resources and city infrastructure to pedestrians rather than focusing on what to do with bikes and cars. Just give me a place where they aren’t around me.