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.
At most of the companies I've worked at, requests need to be submitted to a Ticketing system and we're told to remind people to submit a ticket if they didn't.
Your question raises the important point that communication involves constant negotiation of different attributes (time, medium of preference, tone, etc.). Those who are good at it will read the room, and sometimes make exceptions so they don't come across as draconian or out of touch.
Did somebody gently redirect you to email instead of Slack when you felt Slack was your medium of choice? You can always respond with, "Sorry, email doesn't work for me because [reasons], please reply here, thanks!"
Everything is a negotiation. Get good at negotiating and these issues become trivial.
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.