From my experience, SSDs tend to just disappear from the bus when they're done. If there's JTAG pins, maybe it's OEM recoverable, but good luck. At least with spinning disks, they usually have a media failure which often has warning signs. Bearing failures are usually seized at startup and there are ways to get them moving and then do a full dump. If the electronics fail, often you can pull a board from a working unit and attach it to the media and get good results. I don't think it's reasonable to swap flash chips onto another board (but maybe, I dunno?).