Those degrees of happiness can't be measured, especially on the long run. And your demonstration can be flipped easily : if A's happiness degree is so strongly

Those degrees of happiness can't be measured, especially on the long run. And your demonstration can be flipped easily : if A's happiness degree is so strongly correlated to the way laundry is processed to the point that changing B's natural way of doing things seems a crucial matter, then perhaps B should figure out how low his value is.