i think the point was to avoid incessant beeping due to multiple short sentences.
I have seen the embarrassment on people's faces when in a meeting and their IM app starts beeping like a time-bomb after someone has cut the wrong-wire.
The sender sending a short 1 liner and waiting for acknowledgement before proceeding would prevent this.
(results in a single beep if the receiver is busy)
Its also avoided if the sender simply sends their entire query as a single message.
(again results in a single beep if the receiver is busy and doesn't reply)
In my opinion, that's a bug in most chat apps. Multiple messages in succession from the same sender should only beep once. But I realize most people use restrictive apps, so they have to adapt to them rather than the other way around.
I have seen the embarrassment on people's faces when in a meeting and their IM app starts beeping like a time-bomb after someone has cut the wrong-wire.
The sender sending a short 1 liner and waiting for acknowledgement before proceeding would prevent this. (results in a single beep if the receiver is busy)
Its also avoided if the sender simply sends their entire query as a single message. (again results in a single beep if the receiver is busy and doesn't reply)