Great post about doing points inquiries one at a time.
Another data point. This morning I did my usual grocery run to Superstore. At checkout I did a bunch of PMs but completely forgot to scan the 5,000 pts for $20 spend coupon. When I got home and remembered, I did a points inquiry (using the app) asking for the 5,000 pts on the basis that the scan never went through (of course it didn't--I forgot to get the cashier to do it .) A few minutes later I got an email that my request had been fulfilled. So even 5,000 seems to be in the threshold for automatic responses.