As for grass clippings adding nitrogen as you shared plus use for mulch and adds in to compost. I live in a residential neighborhood and often pick up bags of cut lawn grass at curbsides during the season. Can never have enough mulch or compost and grass clippings work great and breaks down quick too. The neighbors must think I’m an idiot but I don’t care—free mulch with pickup truck.
I try to grow about 50% of my crops to be high biomass. Stuff like winter wheat, corn, etc. That way I have lots of stuff in addition to the regular yard waste.
The other half of my winter crops are cover crops such as clover, hairy vetch, and winter rye. I don’t think any of our neighbers have grass clippings. They all just cut it and let it be their mulch for the lawn.
We could probably snag some leaves that they burn in the ditch. However, that would be really odd, since we don’t usually rake leaves till the spring.LOL
Come to think of it though. We live downhill, and the way the wind blows we actually get a lot of their leaves in addition to our own.LOL
We do have some neighbors that do a little gardening too, and for some reason they don’t seem to be in any hurry to get rid of their clippings. Darn!