Problem: large chunks of philosophy and economics are based upon wanting and liking being the same thing.

I don't think that is true.

"Wanting" maps onto expected utility; "liking" is the reward signal - the actual utility.

That framing surely makes it seem like pretty standard economics.

There are some minor footnotes about how the reward signal can sometimes be self-generated - e.g. when you know you should have got the reward, but were just unlucky.