You're from the current generation of selfhosters, which culturally is very similar to kit car builders. The next generation of selfhosters/indiehosters just want a car to get from point A to point B. Sqlite is better for those people.
Maybe that’s what most users want, but that’s not what the software was designed to target, judging from all of the documentation and marketing. But yes, clearly the software wasn’t designed to run in a distributed fashion, and that’s kind of the point of my criticism—they had to go out of their way to couple their application in a way that precludes distributed execution. Well designed server software is trivial to distribute, and even if you never run it in a distributed configuration it makes it easy to do the basic parallelism described in this article.
That’s a bit of a strange argument considering all the hoops one needs to jump through to make Jellyfin work on account of Sqlite. I just want to run the software I use on the computers I have.