PR gets to harvest its own taxes, whereas the other states are tax fiefdoms for the Federal bureaucracy. This is truly a superpower for Puerto Rico.
In return, PR doesn't get to vote for president, or have senators or congressmen. But I can tell you, all those are worthless. My state's representatives (when I lived in a state) served the Federal bureaucracy in practice, not the people of the state. They are cronies for their political parties.
I personally believe that PR's mediocre economic situation is because their own elites steal all the money they get (like the $80 billion or whatever they defaulted on), and because the vast majority of Puerto Ricans have already gone to the States, creating a massive brain drain. I do not believe it's because of the Jones Act or some other form of colonialism.