Coming from the other side of the "camp", I find tuning arrows a lot of fun and has become an extreme confidence builder over the years. While there are many of you out there don't want it or need it, some of us actually like it. I like to tinker with my gear and have learned a lot more through experimenting on my own and through the experiments of others than I ever would have following a norm or what I was originally taught.
I too feel for those who have trouble tuning. However, I firmly believe anyone can tune with 1) proper form and 2) a bit of guidance. It's amazing what kind of improvements can be done with a video of the shooter and following the proper procedure for tuning. However, #2 is useless without #1, so I agree with the posters that say this is of primary importance.
I also am positive I am a far better shot with tuned and dialed in equipment than without. It is not "the" factor but for me, it is certainly a beneficial contributor. I and others I know have helped improve the shooting of archers simply by helping them get their equipment tuned. I don't mean getting to paper plate size, I mean tennis balls and smaller. Their form and overall shooting skill was good but they suffered from multiple maladies, including discouraged confidence, that were alleviated from systematic adjustments to equipment until it was on. Their confidence soared and in turn, I think they are better bowhunters for it. I'm sure everyone would agree if it will help you take a more ethical shot on an animal with trad gear it certainly can't hurt.
If you don't want it and are happy with your results, then by all means I wish you the best in your chosen method. But if you aren't satisfied and want every possible ounce you can squeeze out of your gear, then tuning, and "micro" tuning just might help you.
Yes, it can be as simple or as complex as you want, but that doesn't mean either is better than the other. It is simply what you choose it to be.