Late to be joining in, but a point or two about low actions and neck relief ..
There is a "correct" amount of neck relief - it's the centre of an acceptable small range of neck relief, but I find that the "best" relief can vary from player to player - if they like a low action, where they want the least buzz. I've even found the odd guitar that seems to behave better either dead straight or with more relief than I'd have expected. (I'm looking back over hundreds of set-ups).
Many guitars are on their way to needing a neck reset but are not really there yet. The "acceptable range" of relief I referred to can provide some indirect and temporary benefit for the owner - in the same camp as lowering the saddle further than ideal to get you by.
The number of players who believe their guitars which have never been tampered with are still spot on support that "acceptable range" may be a lot bigger than I would claim.
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