>On the other hand, Amazon delays orders on purposes if you aren't a Prime member.
I'm not so sure about this. I'm not a prime member and I frequently get orders delivered before the estimated delivery date. On the other hand I also see instances where amazon takes suspiciously long to ship something. A charitable explanation might be that their logistics capacity (eg. planes or vans) is limited, so if you're not a prime member you get deprioritized.
At my college town around 2013, any prime delivery would always take a day longer than it was supposed to. Saturday delivery wasn't common there at the time so you had to get your order in by Wednesday morning at the latest otherwise you'd be waiting until Monday.
I’m absolutely sure that there is an amazon FIFO for orders that sometimes get delayed days in shipping in order not to build up an unnecessary queue that wouldn’t get emptied for pickup. Probably has a lot to do with them running their own logistics.
I'm not so sure about this. I'm not a prime member and I frequently get orders delivered before the estimated delivery date. On the other hand I also see instances where amazon takes suspiciously long to ship something. A charitable explanation might be that their logistics capacity (eg. planes or vans) is limited, so if you're not a prime member you get deprioritized.