While I absolutely agree with the downsides you mention in the 2nd and 3rd paragraphs, the first paragraph is kinda trivial: all systems break down when humans

While I absolutely agree with the downsides you mention in the 2nd and 3rd paragraphs, the first paragraph is kinda trivial: all systems break down when humans get involved. As for the last one... what about images? People tag them too, and no "full text search system" exist for them unless you count "textual inversion"/"interrogate CLIP" which would still requires quite some hefty amount of manual tagging for the initial training.