I find cat discussions interesting. Having rescued many, and had up to 10 living outside and a few did come inside over the last 20 years I never found "brown" spots from their pee in my lawn, and as I worked my beds pulling weeds or planting new plants I never came across a mound of poop from any of them. No clue where they pooped outside, maybe they went to the woods to do it. Or my cats were of a smarter group who talked among themselves as agreed not to pee on "mom" lawn or poop in her beds.