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It's the hedonic treadmill. If you had to hand wash all of your clothes, getting a washing machine would make you very happy... for a little while. After a few weeks or months you'd be back at the baseline. Likewise, if your washing machine broke and you were prevented from replacing it, you'd be unhappy... for a while.

I think this fits perfectly with happiness being strongly driven by comparison and expectations. Those comparisons can be real comparisons to other people or imaginary comparisons to hypothetical outcomes. Comparisons are relative so you'd kind of expect them to remain even if the baseline improves. Same with expectations.

> I’m certainly happier not having to hand wash dishes or clothes

The prospect of loosing access to those things can seem bleak, but to someone who never knew the luxury of a clothes washing machine it's just another chore. Why would they be any more unhappy? Everyone still does chores. We find ways to avoid letting them make us miserable.