The point is - while all of these systems are fuzzy at the edges, that is not a bug. Letting people reside in a few countries at the same time, and to pick a tax residency like a new winter jacket is a non-objective for the border, tax and residency systems.
It's actually relatively simple to follow the rules that lead you down the well estabilished residency paths if you do the opposite of what the article suggests and leave enough of a buffer for every required number, so you don't need to think about it and the precise count can be handwaved by the officials.
Conversly, if you try to minmax the rules, you might find that most important systems still have an arbitrary human decision maker, who simply decides whether to apply a complex ruleset to the letter, or to be lenient.
I'm curious how you managed to find nothing on lcamtuf. He's one of the most famous Polish hackers from the 90s, then one the best security researchers Google had. Even if you live under a rock, the substack has an "about" section.
If it wasn't for Michał I'd probably be a farmer today.
I wouldn't be surprised if you could chase someone for gross negligence, if it was a result of, for example, consciously prioritising features over security, or "I know the rules but they are BS" thinking.
You can do that with doctors, and they often make mistakes because the hospital overworks them, or simply allows bad behaviours to continue.