Another experience: my (second-hand) Kindle Paperwhite suddenly started to displaying ads. It had never done this and I had specifically bought an ad-less version. Go to Amazon, open livechat - fixed within a few minutes. Another company would have probably told me tough luck and to buy the ad-removal.
These days, the only time I don't comparison shop agianst Amazon is when I know that there isn't likely to be a better deal...and the sum total of that is pretty much going to Amazon for my a digital download of TurboTax every April. I don't have Prime but it still ships immediately. Generally, if I am making a long tail purchase, I start with eBay due to its better transparency, straight forward search, and less misalignment between its economic interests and mine. For electronics, I'll probably just buy from NewEgg because of how bad Amazon's search sucks and because it's free shipping is freer as in "beer" than Prime's $99...which of course applies to Prime items but not not-Prime items and to me, it's not worth the brain cells personally and the five minutes economically to figure out which is the best value SSD...and if I want it fast, there's a Best Buy up the road...and a Walmart.
In fairness, I find returning anything to be a hassle but since I have a brother in law who returns annuals to Home Depot at the end of spring, I know some people arrange their lives around it. Anyway, if something really sucks, I can chargeback.
Though I do also use NewEgg, which irks me nearly as much as Amazon, in that I always reduce down to the products sold by amazon, same on newegg... I don't want to deal with all the reseller. If Amazon stocks the product, odds are at least the product line is okay. The only place I get bit is misc adapters, some are great, others have a weird fit. That includes Amazon Basics products which are often hit or miss.
The experience you describe regarding Amazon Basics pretty much sums it up. Amazon puts its name on products that are crap because it is in their interest and despite their interest clearly not aligning with mine. Ebay avoids the temptation by not putting their name on products. If it's crap, it's because of the seller not Ebay.
But that is also because counterfeit goods are less of a problem with Laptops. For many other things Amazon has a real problem there. It's okay to be a bit more expensive if the service is good, it is not okay when I have to be one the lookout for fakes when buying there.
And for the site I have that links to Amazon offers, all the scam offers that are or at the very least were active there ("send a mail to [email protected] before buying") were a real problem as well.
The fact that Amazon fooled you for so long is telling.
Amazon's goals NEVER been to be the lowest price on everything. They want to provide the best value (convenience, trust, etc.) to the customer. And they do!
I don't even comparison shop because I know Amazon will get my order here in 2 days and it won't be a hassle if I have to return it. Who cares if I'm paying an extra couple of bucks here and there?