Earlier quoted context omitted.
Utility is a well-known concept in economics. It's strange at first to the outsider, but it's easy to understand with a little reading.
>Utility is a well-known concept in economics. It's well known but it still has a circular definition. Why do people spend $X on goods? Because it provides $X worth of utility. Why does it provide $X worth of utility? Because they spent $X on it. Ultimately it therefore ends up being rather meaningless. It's also non-disprovable which makes it non-scientific.
And it's perfectly scientifically sound idea. It's just too complex for us to solve very accurately. (Like a lot of important problems in science.)