[GSGBen]

In a group, sure. On your own though it's an incredible technique to get over mental hurdles. Instead of letting yourself get distracted because a problem seems insurmountable or you can't see a path all the way through, try brainstorming entirely by yourself.

It can provide psychological safety for your own subconscious. Write down every idea, regardless of how ridiculous it is. Every "What if I...". I sometimes do a question and answer format in a simple text/markdown document. Write out a question that's one facet of the issue you're working on, and answer it with a bunch of different options. Then discard or select or flesh out the responses. Ask questions about what might and might not work with each option.

It's amazing what having a few different new paths to try can do for your energy levels and motivation.