My solution is in the paragraph below this intro:
I thought about this while reading someone else's post. I agreed with them when they pointed out their history on WoW. My history is similar. I started playing wow with the fantasy-based and fun-loving mindset that I intended to play the game with from the beginning to get max enjoyment out of it. I did. I loved it. Made amazing lifelong friends while leveling. After approaching max level and even after being max level and seeing more and more horrible people on that game ruin it for everyone and blizzard desperately trying to come up with solutions at the time (this was their second expansion when blizzard was still almost completely the original blizzard), I took their attacks personal and made it a point that for years I will prove everyone wrong and never once lose top dps spot. I achieved that goal. I did lose number one spot a number of times in raids, but the point being, I was hailed in my guilds as being the unbeatable guy. I proved people's guide websites wrong. I killed their idols. I dethroned what they believed to be true in my quest to teach people by proxy on how futile it is to always try to put others down and rise above to achieve self-glory. I failed in realizing and accepting how big of a task that is to convince an entire global population of this one thing - how to be a good person and let the guy I used to be - the fun loving person who never cared once about "being the best" to play as I pleased, because there are countless others who would have loved to have been treated the same. I, and others, always have the same potential as anyone else no matter what, so to me, it is futile to put down on other players for any purpose at all. They can always do what you can do. Everyone should understand this on a deep level and learn how to get along with each other naturally - nevermore to compete and belittle someone else again over something so silly that only a select few do and should care about.
My solution: Why not add attack dummies that have a damage number show up on top of them when you attack them them to show your damage score, so you can measure yourself without the use of an add on, and when you click off of it, the game is still the same way it was as before - without the use of an add-on. This solves every problem argued except for the people who want to judge other people. In that case, perhaps make an entirely optional instance where you can measure yourself in different scenarios (standstill, aoe, bossfights, mix, etc) and show a score to somebody as well as a breakdown so those people can be satisfied, but let's not get too distracted. My simple idea is the attack dummy with a number that shows on top of it to display your performance. Let's choose that as the starting point, and add your ideas onto that further to see if that is acceptable.