This is a long standing gripe I have with the Apple Watch too—a busy group chat can effectively DDoS you out of being able to use the thing, because notifications are always full screen. There’s also a ~2 second delay before a notification can actually be dismissed, because it has to complete its swoopy animation first.

It doesn’t sound too bad, but when your average interaction with a smart watch is 10 seconds or less it becomes a real annoyance.