When you are blocked by a trivial issue - eg., what's setting this value in the db - that someone can answer in 5 seconds in person, you can figure out on your own in 30 minutes, or you can ask via slack and get an answer after a minute or a day.

During the pandemic I had to take over a project for a guy that was retiring, and my chat log with him is basically me talking to myself, going "nm found it" up to a day after my last message.