A lot of people, myself included, have complained that once you have all traditions (which you inevitably will) the entire feature and resource generation of Unity is useless. There could be a lot of options to change that, but one that should be relatively quick and simple to add would be making it so that you can swap out ascension perks, at an astronomical unity cost. Doing it cheaply would be broken, and not all should be swappable (just the ones providing numeric bonuses and little else) but it would let you re-develop early game stuff into late game stuff, with enough cost that it's not like there isn't still an advantage to people who take the longer view from the outset.