It’s also the case that market-ideals tend to become miserable to experience in practice if you approach them too closely.

Usually the discussion of that kind of thing revolves around the near-elimination of profit via (hypothetical) too-perfect competition among producers and too-perfect information for consumers, but with the rise of automated mass-scale spying and automated finer-grained price discrimination (plus enormous consolidation of markets due to near-abandonment of anti-trust enforcement in the ‘70s), we’re kinda seeing the real deal play out the other direction: approaching-maximum extraction of profit from every transaction.

Which sucks, to put it mildly. You do not want markets that function “too well” in any direction.