I'll never understand how you can make all these cuts with dozens of changes every release
The real answer? I just have 720 cards and do bot practice drafts 10x a week minimum. I have an ever-evolving sense for what cards I like and don't like in my list for various archetypes, and message the group regularly about it too.
There are about 40 cards that I am aware are not "right" for what I'm trying to do in my Cube. My gut sense of this is challenged regularly by my daily note-taking and the CubeCobra draft stats. I am constantly looking at the recommender algorithm for what my Cube is up to and what similar Cubes and/or Cubes by smarter people than me are doing. Of the 40, I haven't emotionally agreed to make half of those cuts, and often will double-down on them to see if I can't salvage them by adding more support before I actually cut them.
But yeah, it's very easy for me to have 20 cards removed at a moment's notice. When I cut more than that, it's usually more a matter of reversing some previous swaps I'd made.