This is a big reason why asynchronous communication works better for me. I can't begin to count the number of problems I've solved in the process of writing an email asking for help. And many more times where the question I was intended to ask changed to a completely different, and more useful question. The process of collecting the information I have, ended up pointing to holes in my thought processes and led to the solution.

If I had gone straight to Slack I would have wasted other people's time, and cheated myself out of thinking through the problem myself.