You have a valid point but also having walkable sidewalks is an important thing. You’d need at least a bit of concrete/asphalt to make sure everyone, especially those with disabilities, can move around.

Making sure the leaves are out of the way allows pedestrians to walk safely (no hidden sharp objects, no slipping on wet leaves, etc.) and makes sure those on wheelchairs are also able to pass.

Not sure why raking isn’t more popular though. I’m tormented by leaf blowers in the morning at 7:30.