Comment by extr

I wouldn't call it brainstorming. More like "alignment". Fleshing out the vision you have for what you need to do, and putting that up against your coworkers vision, and figuring out where the disagreements/gaps are. You can do this quickly if you have an experienced and disciplined PM guiding the discussion, but most people don't, so they just have long conversations. Which works fine IRL, but it's very uncomfortable to be on a zoom call for more than about 45 minutes at a time.