In my opinion the tip comes in when you ask for a service specific to you and a person provides it. USPS is providing a general service to your, let's call it neighborhood. But a barber is providing a personal service to you.
Doordash and the like are more like the latter than the former. You say what you want, a single person in that profession does the work for you, and then you pay their fee and something on top.
Of course I'd rather tips were not necessary but it is practices like this one that make them necessary. And I wouldn't trust them with some rating/bonus system. If these companies were paying a good wage and had good benefits instead of relying on the 1099 economy and skimming payments even after that, we could eliminate tips altogether. I look forward to that day, but until we get there...
A Florist provides personal service to me, and you aren't expected to tip them, as does a cake decorator, or mechanic. This reads like a reverse justification for tipping, that is innately irrational.
Same with a doctor, lawyer, accountant, refrigerator repairperson, gardener, painter, nanny, DMV clerk, bank teller, and the person making your chipotle burrito. Yet you aren't expected to tip them.
I also find "bring me food" hardly more "personalized" than "scan my items and take my money."
The times you tip are when it's socially acceptable to tip, there's no "rules" you can apply that make any sense.
Doordash and the like are more like the latter than the former. You say what you want, a single person in that profession does the work for you, and then you pay their fee and something on top.
Of course I'd rather tips were not necessary but it is practices like this one that make them necessary. And I wouldn't trust them with some rating/bonus system. If these companies were paying a good wage and had good benefits instead of relying on the 1099 economy and skimming payments even after that, we could eliminate tips altogether. I look forward to that day, but until we get there...