[nzmsv]

The chat that doesn't require immediate feedback is called "email".

Otherwise you are stuck with "hey, can you help?" with zero details for when you actually get to take a look. Then you have to say "yeah, what's wrong?" and wait another hour. A properly written email would have solved the issue in a tenth of the time.

[lordlic]

No, I'd argue that there's basically no use case for email beyond stuff that you want the other person to be able to ignore.

If you're expecting a response, but don't care when it comes, that's ideal for chat.