Because the world is on fire, while the richest humans want to consume more. Your replies are typical of that mindset, you could hardly contain your consumerism while living in an area which in much of the world would be considered large and luxurious.
And how much of that did you actually need? Why have two desks and a dining table when you can put a laptop on the table? Why have an L shaped sofa and not a compact 2 person sofa? Why have a grand piano (I'm assuming since you had a lot of space) rather than a compact electric piano?
In our first apartment we had a king size bed BTW, the space under it was great for storage and good sleep is important!
Yeah, several times when I was younger I had to move house with only what I could fit in my car or what I could carry. It forced me to really think about what possessions actually matter, and feel the benefits of how having less stuff helps free oneself from the consumerist mindset.
On another note, geothermal energy isn't feasible for most places, and building from scratch is harder than it looks ... the best thing is to repurpose what already exists to your needs and use it in the best way you can. I bought a house that had been abandoned, and it's gradually coming into shape with improvements like insulation and double glazing ... eventually I hope to have heating from a heat pump, but that's out of my price range for the moment.
I'm not a fan of queens, however you and your opponent should go on a horse riding experience day together to remind you that the horsey is clearly the superior piece to choose.
As mentioned in another comment, when my other half was rebuilding a motorbike in the living room of our old flat, I didn't even have to move any furniture. She would tinker away pulling the engine out while I practiced guitar.
Are the hobbies that you have things like indoor rock climbing at home?
I had a 45m^2 single bedroom apartment which had a lot of wasted space (like, there was room in the bathroom for another bath, amongst other things), we had a full compliment of white goods, and there was enough space that when my then girlfriend/* could rebuild a motorbike in the living room without having to move any furniture or even park either of the bicycles outside.
Yep, I remember in one job I was at for 8 years a manager 2 levels up complemented me for sorting out the networking for a re-arrange of our own office ... I was gobsmacked because I'd been managing a whole network and server upgrade for a client that involved well over 1000 users at the time yet an hour of fiddling with wires under desks was the only thing that got his attention.
My favourite Dutch word is Slagboom