Why? Purely for science. That and I cling to the conspiracy theory that SLC is vastly superior for using NAND as cold storage.
I had an epiphany when I first read about dynamic SLC cache for SSD’s: the NAND doesn’t determine the bit depth, the controller does, and this can be changed.
So the question is, is there a way for a user to change the bit-depth on any consumer drives, whether officially supported, or through hackery?