The house I want isn't available, so I'm going to buy the closest thing and make the changes I want... building a pizza oven is a lot of time and effort, but tearing it out isn't. I'm not sure how much a pizza oven adds to the price of a home, but I'm guessing, not that much because most people aren't going to understand its value ... anyway, as a buyer it's not like I'm getting a list of features I can refuse some of, the house is being sold with the pizza oven and I'll deal with it when it's mine.

Exactly. One person bought a house and added a pizza over because he wanted it, another bought it and removed it because he didn’t want it.

It’s nice to think we might do something that lasts a long time but the more nonstandard it is, the more likely it will be changed someday.

A similar effort on a fancy “outdoor kitchen/barbecue” in a more outdoorsy state than WA may have lasted a long time.

You're buying the land and location. There's always someone willing to make you a new house for the right price, and you can get it done exactly the way you want it. There's nobody that can make new land, particularly not in the place you want it. You can change anything about a house except its location.

Because the land under the house is worth so much more than the "improvements" on top of it that the improvements might as well not exist.

It's too cheap to pollute the planet, the solution is to price in the externalities, tax everything the amount it costs to clean up the pollution it causes, then spend that money cleaning up the pollution