Why isn’t more detail always better?

There is fidelity and there is the personal 'sounds good to me' but the latter is personal and varies with the listener. Fidelity means reproducing everything that is there. If it's on the source it should be in the listening. If it isn't that's a flaw in reproduction. Hopefully the detail is not accompanied with other problems, other fidelity flaws like brightness, etc. But even if it is loss of detail is a flaw in fidelity. I personally want it all fidelity wise and if the result is not pleasant because the source is poor, so be it. The only way superior sources sound superior is if all the detail is in the listening.