Seems like most of the points you listed are a deterioration from the customer's perspective.
The last time I went to IKEA, their website had said they had 50+ of an item in stock, but there were 0 where it was supposed to be. I had to spend 10 minutes with an employee for them to find where the entire box had been misplaced by another employee, in another aisle.
When employees mess up (which is very common, we're all human), you can't take care of yourself. You need another employee to fix it. It has nothing to do with being a "big boy".
Despite bagging your own groceries being a universal experience I haven't yet seen a local properly use a self-serve checkout kiosk. Instead of scanning an item and putting it in a bag on the weighing platform they instead scan the items and put them on the weighing platform, then pay, then put the items in the cart, move the cart towards the store exit and then bag their groceries.
Or even better the stores that do self scan with a hand held scanner, just walk around continously bagging in your cart, put the barcode scanner in the holder when you exit and pay with NFC.
Sure, just like flights are not as cushy as they used to be. The "deterioration" is more than compensated for by the drop in price.