I live in Seattle and while I am aware that not everyone lives in a similar environment the concept of a minimum 5 acre lot staggers me. I consider myself lucky to have 600 square feet.
What kind of area has these rules and who sets them? To me a lot with 5 acres is officially "the country" where I would expect very little to zero regulation of what you can build.
For example, here is a zoning map for New Canaan, Connecticut a suburb of New York in south western Connecticut. About a 25% of the town is zoned for 4 acre lots, 50% for two acre lots, and 25% for smaller lots (just my estimates from looking at the map).
He's in Western Washington, but not too close to Seattle. To him it's "in the country" but it's right next to town. I live in a rural place, "in the country" means something entirely different to me.
My definition of "country" is having a yard big enough to throw a tennis ball for your dog as hard as you can, as far as you can, within your property, and not have it hit something. Just any linear stretch of maybe 150'. People in cities very rarely have that, unless it's some kind of billionaire hilltop mansion type situation. Many people can't even own a pet because their apartment disallows it.
Same thing would apply to shooting a gun on your property. If you can do it without the cops coming, you live in "the country" as far as I'm concerned.
What kind of area has these rules and who sets them? To me a lot with 5 acres is officially "the country" where I would expect very little to zero regulation of what you can build.