Agreed. There are only three modern/common communications channels which are truly synchronous:

1. In-person communication
2. Phone calls
3. Video calls

Everything else is asynchronous, and does not necessarily involve an interruption or a disruption of your time - you can get to it when you want to, within polite reason.

And with the fragmentation of our attention due to social media - to say nothing about the broader nature of our modern culture - being able to handle communication asynchronously is becoming very important to people.