I'm at around turn 50 in my game and haven't bothered yet. I've been fully modernized for quite a few turns now but haven't researched the +2 happiness/repression techs in the 3rd or fourth tier because there seem to be better stuff to research. I've been mostly building inns (market line) and police stations in my provinces. The next unlock is pretty expensive at this point in the game so I'm upgrading ports, specialty buildings and inns first. Somebody who's better at math could crunch the numbers more to see if the tax increase is actually worth it versus upgrading inns.
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