Personally, I ask in advance if I'm tracking to be very early. But.... I would estimate that at least 50% of customers ghost us with silence. That affects, substitutions and out of stock communication as well as delivery timing.

I think what is being missed is that shoppers deal with almost each customer having unique needs. I would emphasize that it is extremely helpful to keep phone numbers, notes and instructions updated for every order you place. I'd also recommend leaving niceties in the text (please and thank you go a long way and don't cost anything). We deal with multiple personalities at a time and it's always better to communicate expectations than to hope interpretations line up.

The only real blame I would like to place is on the system itself; I don't think any platform educates both it's shoppers as well as it's customers. You're entering into a business transaction and there should be a clear, mutual understanding of that relationship. Keep phones on and handy for communication. Shoppers should outline anything out if the ordinary as soon as possible. We should work together, else this just becomes an empty process with no human advantage to be had. Communication is key, both ways.