I linked it here because, with regards to "already standardized the hosting side of static sites by using the file system", it means squat if the webmaster-to-be doesn't know what a file system is. There's no preconception of using files to hold and serve data from if you don't know (and possibly don't care) about file systems.
If we're going to be discussing attempts at changing the paradigm, then it stands to reason to understand the environment at large that might be encouraging it. If we're going to be talking about something replacing file systems for data storage, it's pertinent to know first of all that the younger generations give zero bits about files.
Also, SEO is at best a tangent to data storage and serving. Some webmasters might not even care to bother with SEO if they don't care about search engine rankings.
[the author here] The article is not about misunderstanding file-systems.
As I've commented earlier on a different thread, <https://news.ycombinator.com/item?id=32733825>, the problem is that when it comes to performance and jumping through the hoops the internet gatekeepers (i.e. the search engines) have set out, just dropping some files somewhere the web-server can pick up isn't enough; there are additional tasks that can't be easily performed with files-on-the-disk approach.