Leaves on the ground can become leaves in the street, blocking storm drains and creating a horrible slipping hazard for cars and bikes. That is one reason why it's important for homeowners to rake/blow their leaves into piles and bag them up for the compost or recycler. It's not just aesthetics. It's safety.
But, they don't here, and there aren't cars constantly skidding on wet leaves, although its a standing joke that the trains are always delayed due to 'leaves on the line'!
Maybe our drains are different, they don't get blocked by leaves that I'm aware of, even in very rural areas with lots of trees.
We don't get lots of snow here as a rule, but the last three or four winters have been very severe with months of heavy snow which is unusual. We don't tend to clear our gardens of snow either, just enough to get cars in and out and move around safely. We use salt or grit on the roads generally.
ETA I went to visit my parents in the very leafy very green area they live in today, I kept an eye out to see what people had done with the leaves, most were just left where they were but a few lawns were cleared, maybe 1 in 20, these were the most formal looking gardens.