It's not access to the file system in generaly that doesn't work reliably -- it's specifically massive access across thousands of files at the same time by multiple processes.

Sqlite lives inside a single file. I've never heard of any corruption issues in practice, even with thousands of high-throughput reads and writes -- the kinds that are being complained about. Because this is something SQLite is really good at.

I was considering walking down this road, because it's really core to the absurdity of this thread, innit?

But, the original post sort of handwaves about what pathological filesystem use is.

The examples they chose (git & npm) imply # of files.

I posit that as easy as it was to handwave that SQLite is obviously superior for npm/git than using N files, it'll be equally easy to handwave that it won't be a problem because SQLite is one file instead of many.