The issue is that in-person, you can see the individual and whether they’re going to immediately respond (since, socially, it would be odd to delay in response

The issue is that in-person, you can see the individual and whether they’re going to immediately respond (since, socially, it would be odd to delay in response to someone who is speaking to you in-person); in chat, you have no idea if I’m going to answer in 5 seconds or 5 hours. And the same for me as I wait for your response to my “Good morning to you, as well.”