Um, it's not 5 products out of several thousand. These are all screwups by a single division that refuses to learn from their mistakes and repeatedly makes the same kinds of mistakes over and over again.
They KNEW that the VYL00M/MAG4FA/KYL00M fwrev 0x19 was faulty, and they kept on shipping it for MONTHS in devices even though they had a newer fwrev (0x25) that didn't cause these problems.
They KNEW they had a track record of secure erase issues, and a year after becoming aware of a device-bricking bug, they were STILL shipping products vulnerable to that bug (the 840 Pro secure erase mess).
You simply don't see this sort of crap occur with eMMC chips from other manufacturers like Toshiba. Yeah, some of them have quirks, but none of them have such severe bugs that they render the device they're installed in unrepairable without a motherboard replacement.