The NAND flash manufacturers usually have no software involvement unless they are in the business of also selling SSD controller SoCs. They will typically sell FDKs/SDKs that are heaping piles of garbage written overseas for their SoCs that provide minimum functionality for interfacing with all of the components.

I wouldn't really expect controller-less NAND flash to ever meaningfully compete with what we have now. There is a lot more specialized hardware in a typical SoC than just a microprocessor and NAND flash chips