Very good points indeed. The end user will always adjust to taste as you say.
I have built several guitars for friends from all Warmoth parts...starting back in 2009....literally from the ground up. I usually let the instrument sit for a while...at least a week, to afford the wood time to relax and adjust climatically before doing final setup...which I always do the same way.
On my own guitars, I always start with a measured .010"/.012" neck relief. This setting seems to work well for me and I set everything to this specification.
I will generally set everything to .035"/.040" (unfretted @12th fret) on bass and treble side and see how that works. This almost always works. Even if I alter this measurement later, it is recorded.
The Les Paul Custom Replica I set up for Mom recently ended up being about .050" @ the 12th unfretted (.046"/.009" Ernie Ball's) on the bass side and .045" on the treble, with the 14" radius neck set almost flat @ .006"/.008" relief, which, I did all by "eyeball" and just recorded the specs when I was finished.
I set the action on the 2016 Gibson Les Paul 50's Tribute to the exact measurements as I always use - .035"/.040" with .008"/012" relief - and it played very well with no buzzing....after knocking down several very high frets by hand.
I have a engineering background and worked many years as a machinist, so measurements make sense to me....its all about consistency, economy of movement and repeatability.
Now, there is more than one way to do things and if you choose a different path, that's fantastic too.
Not long ago, I helped a friend setup a few guitars at his shop. I could complete a setup my way, with my ruler and feeler gauges, before he could finish one using his strumming, adjusting, strumming, adjusting by feel method.
Any way you choose to perform a setup is "right" for you...no matter how much others may try to convince you their way is best...
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