There's a difference between something urgent and something that's merely time sensitive, I think. In my example of scheduling tennis practice, updates need to

There's a difference between something urgent and something that's merely time sensitive, I think. In my example of scheduling tennis practice, updates need to be timely, but they aren't urgent enough to warrant spending time on the phone with everyone involved. Firing off a few asynchronous messages actually means the last few people I would have called get the information quicker than if I had called each person individually. Voice calls are great for a lot of things, but are slow, tedious, and unnecessarily single-threaded when it comes to plenty of time sensitive communication needs.