What policy changes do you think have resulted from that?
I think the main effect from that is the right being less supportive of markets (and especially international free trade) and the left being more supportive of markets. It's changed the character of the movements a bit (I think that's responsible for the big CTism shift), and it's led to a huge competence gap when it comes to staffing and advisers. This is something that Republican partisans will publicly push back on, but Republican politicians complain about it a lot.
That was a big part of Trump's failure to get anything done on infrastructure, even after publicly announcing that it was a priority and despite bipartisan agreement that it was needed. So we ended up getting Biden's infrastructure deal instead, which was a bit different from one a competent Republican administration would have done. So that's another area where educational polarization affects policy, but it's kind of subtle (not as dramatic as Xes used to favor Y, but not anymore).
I think that's partly behind the GOP reliance on courts to get policy done. Religious fanatics no longer see pushing their issues as a political winner or something they can do legislatively, so they've redirected energies to filling courts. Again, there are policy effects but it's not leading to changes in stances.
Big businesses naturally care most about deregulation and cutting taxes on big businesses. The Tech industry was an aberration while it was growing, and it still relies on a heavily educated workforce, which pushes things a little to the left, but management is increasingly acting like an old, entrenched industry that still has to keep left-wing employees happy. I don't anticipate any change in what political parties do as a result of that, though.
I don't think there's any evidence that CU has had an impact on national-level policies, but it has helped Republicans in state-level elections. That's not a party policy change, but changing the mix of who wins elections changes enacted policies.