I don't think unrealistic dreams have to lead to regrets. I have a dream home, and I don't think I'll ever build it, and that's fine. I like occasionally thinking of my dream home, it makes me happy, and I don't need to actually have it become a real home.

Since it's just a dream, I don't have to worry about where to build it, or if the things I dream about are practical, and I don't have to worry about any trade-offs, since it's just a dream.

Even if I had a million dollars, and I could afford to build it, who knows if it would even work? There's a reason why real life houses don't look like my dream home, and I assume it's because of some things that I'm not thinking about when fantasising about my dream house.

So, I'm perfectly happy with having unfulfilled dreams.