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I’ve never seen a leaf blower used for grass up here. Only leaves.

But I also never see the gas powered backpack blowers portrayed on TV so maybe I’m perceiving a different context.

I think the point was, if we didn't have lawns then leaves could remain where they fall and mulch the soil.

Leaves get everywhere and cover sidewalks, roads, roofs and gutters, etc. Over time, they degrade into an unsafe slimy surface.