It may not apply to all brands, or technology may have moved on since, but they found that generally SSDs don’t die, they just lose their ability to hold a charge (i.e. the data).
In their tests, if you didn’t power the machine down, the drive continued to work long after its expected death date.
The problem was that without any prior sign of an issue, if the machine had to be powered off for any reason, the drive had disappeared upon restart.