There are plenty of substantiated articles out there

about staffers writing letters, staging/planning walkouts, etc. due to Biden's position on the war.

I agree on your points about the abortion debate. One of my hopes with the overturning of RvW and moving it back to the states is that it would open up the possibility of more nuanced positions on the issue, as the issue will get more attention at the state level and laws can be passed that impact the issue more locally than just a monolithic policy at the federal level. Who knows if it will happen or not.