I definitely agree with your point, but I think there's a small distinction to be made that I see. In my experience, Kirkland Signature products have generally been rebrands or slightly modified versions of quality products by trustworthy brands that cost more in their OEM packaging. This is perhaps true with many Amazon Basics items, but it doesn't seem as consistent as it does with Kirkland Signature's lineup. I would feel comfortable buying a KS product and assuming it is of good quality, even without Costco's notably flexible return and refund policy as a backup.