[lukethomas]

Here's a helpful rule of thumb for when to use synchronous communication:

Is the conversation ambiguous and is there a high likelihood that you will be misunderstood?

An obvious tell for this is when you go back-and-forth over Slack/chat for a few minutes and people still feel like they are on another page.

I strongly recommend checking out media richness theory. It presents a helpful way to think about what communication medium is most appropriate for a given scenario.

https://en.wikipedia.org/wiki/Media_richness_theory