Rant: I hate brainstorming meetings. A manager who wants to feel like they are doing something invite a mix of one or two experts, a clueless pm, engineers from an unrelated project, and handful of random ones hers. Next, with zero preparation we’re supposed to come up with groundbreaking new ideas. Then there is some voting and finally waiting for a summary or gameplay that’s postponed until the heat death of the universe. Perhaps I will bring cookies next time.

I actually enjoy brainstorming meetings in-person. These actually feel like a "brainstorm" when they're done right.

Brainstorming meetings over Zoom, on the other hand...

Sounds like a very poorly run brainstorming session.

How to do it right (IMHO): Have several short but rambling hallway conversations about the upcoming topic for 3-4 days before. Take long showers and let your mind wander. Then do the brainstorming session.