[gingerrr]

That again sounds like a problem with your company's knowledge sharing culture, not with the industry at large. Silos exist even when every butt is in an office seat, that's a well-known issue that far pre-dates pandemic remote work moves. The answer isn't "make everyone defenseless to random interrupts from other people" but "learn how to actually document things so you're not a company full of points of failure".

It seems like what you really want is for others to treat your emergencies as theirs. They're not, they're yours. If you can't wait 15 minutes for a ping back without being completely stuck, you aren't planning your work correctly. That's nobody else's fault.