I mostly agree with your interesting comment, and I think your analysis basically jives with my sibling comment.
But one thing I take issue with is the idea that this type of thing is a good faith effort, because it’s more like a convenient excuse. Explaining substring search or even include/exclude ops to children and grandparents is actually easy. Setting preferences for tutorials vs API docs would also be easy. But companies don’t really want user-directed behavior as much as they want to herd users to preferred content with algorithms, then convince the user it was their idea or at least the result of relatively static ranking processes.
The push towards more fuzzy semantic search and “related content” everywhere is not to cater to novice users but to blur the line between paid advertisement and organic user-directed discovery.
No need to give megacorp the benefit of the doubt on stuff like this, or make the underlying problems seem harder than they are. All platforms land in this place by convergent evolution wherein the driving forces are money and influence, not insurmountable technical difficulties or good intentions for usability.