While what you’re saying is valid, what you classify as bullshit (log-structured storage) is still immensely popular and important in the world of flash.

In my experience, read-ahead is still extremely important, even when you have SSDs, and unless all your writes are >4kb, you’re still going to benefit from a certain amount of “sequential-ness” of your writes.

Optimizing things for disk storage still does pay of tremendously, it’s just that the way things are optimized are very different, and perhaps much more nuanced.

Where before it was just as easy as saying “just read/write things sequential, random access is expensive”, nowadays you need to think about how the kernel interacts with storage, and sector sizes and whatnot. There definitely are do’s and don’ts when optimizing data structures for this.