Yeah, this jumped out to me as especially insane. That's what the Save feature is for!

When someone Slacks me something that's clearly non-urgent, I just hit Save on it and come back to it later. No big deal. It's actually a wildly useful and probably underutilized feature.

Requiring others to message you _just so_ to match your own particular idiosyncrasies, because you insist on bending reality to your will rather than working in the same plane as everyone else, makes for a colleague that others dread interacting with.