I guess, from our point, the photographer / printer, we need to have some kind of standard, to avoid issues such as, well it doesn't look that good at my place. Well if you change your light, this might bring your new expensive image back to life.
Maybe I have gotten it wrong.
In my own situation, I do work for, myself and other photographers, publishers, prints, canvas, books, etc... i need to feel confident that I am eliminating any potential problems
How to best deal with this, and yes, I am probably going crazy :-) its that elusive search for that something... :-)