I spent two whole pages explaining things to you in step-by-step detail and referring you to multiple further sources of information.
I led the horse to water. Beyond that I'm not going to sit around wasting my time trying to make you feel better about ignoring the information that's out there for you.
You're just here looking for somebody to come in and say: "good job, what you did is valuable, productive, and has merit."
There is not a single professional here who is going to say that and validate what you did because none of those things is true.
You asked a direct beginning question: "is it possible to calibrate a display using a digital camera?" The answer to your question is an unequivocal NO.
You didn't like that answer, so you proceeded to want to know WHY that was so. I spent an inordinate time explaining it to you. Which you didn't understand anyway, and don't seem to be making much of an effort to understand.
Now you want to get into an argument about how what you did was useful anyway to make yourself feel better about what you did in the hopes that someone will validate your enterprising, but ultimately unuseful exercise.
Sorry, you're not going to get that from me. Maybe someone else wants to babysit, but it's not going to be me.
This is where the discussion ends and we all post silly demotivators for humorous relief rather than having our teeth pulled by someone who doesn't understand what they're doing and has zero understanding of color.
If you want to understand more, re-read the thread, look at Poynton's chapter on color science in his textbook, and if you're really enterprising, try to tackle a book about color science.