Scythe, sickle, brush cutter
Most folks yards have been graded and maintained enough to not want these pre-industrial tools.
"Mow with it, if ya' got it"
There are places that grass becomes, um, er, hayfeild. There are modern weed whackers and brush cutters for folks who garden with power tools.
IMO both powered tools and people powered tools to collect, cut down, or reduce under growth, are fine. These are at best less used than a shovel or rake. Again these are tools to size up in the aisle, before buying.
Knowing which are two-cycle vs four cycle gas powered tools before firing your new toy up out in the back fourty, is probably a prudent idea.
I'd hate to cut an acre of hay with a sickle, Putting a yard sale find of one up on the peg-board at $2, against needing to chop the 'stuph' behind the compost bin every other year, seems like a bargain.