While your example is clearly a strawman, I have to admit I tend to many short messages on chats.
It's not email, there is someone sitting on the other side who waits, so I give them something to read. When I call them, they also hear what I say when I say it and not after the whole message is complete.
It's not email, there is someone sitting on the other side who waits, so I give them something to read. When I call them, they also hear what I say when I say it and not after the whole message is complete.