Comment by StillBored

This is like the statement that if I optimize memcpy() for the number of controllers, levels of cache, and latency to each controller/cache, its possible to make it faster than both the CPU microcoded version (rep stosq/etc) and the software versions provided by the compiler/glibc/kernel/etc. Particularly if I know what the workload looks like.

And it breaks down the instant you change the hardware, even in the slightest ways. Frequently the optimizations then made turn around and reduce the speed below naive methods. Modern flash+controllers are massively more complex than the old NOR flash of two decades ago. Which is why they get multiple CPUs managing them.