Living in Europe, most people just leave fallen leaves alone. I've never seen someone use a leaf blower except for dust etc. Is it a uniquely American thing to obsess over tidying up leaves?
But even in cities there’s reasons to clean them up. They clog drains, they lump together in the gutter creating blockages that cause large puddles when it rains, they stain the pavement, they decompose on the sidewalk and people track it everywhere in buildings, and more. Maybe you don’t see these as problems that need solving, but people aren’t tidying up leaves just for the fun of it, they have reasons. We’re not simply obsessed with cleaning up leaves.