Right, and usually SD cards don't have anywhere the level of FTL's that SSD's have. In fact its likely there isn't much of a FTL at all, rather just a simple EC

Right, and usually SD cards don't have anywhere the level of FTL's that SSD's have. In fact its likely there isn't much of a FTL at all, rather just a simple ECC on the flash pages. Lose more bits in that page than the ECC can correct, and the whole card is basically done because it can't relocate sectors. SD isn't meant to be primary storage. Its meant to be used more like floppies/usb sticks. I can't tell you how many android phones I "fixed" for a couple years by replacing the SD cards. I actually had a sandisk 128G fail on me a couple weeks ago, that was just sitting in a dell/windows tablet with little more than a few movies copied to it. It didn't last 6 months, I guess something in win10 must have been rewritting a date/time stamp or something similar to the same sector long enough that the card just started hanging doing reads until it became bad enough that windows would choke and I noticed it. Back about 10 years ago, I had an ARM device with an SD slot that I was writing firewall logs to. The SD cards in that machine would last ~2 months before they died. Eventually I replaced the SD cards with a USB attached SSD in an enclosure, and that fixed the problem.