While its anecdotal, for the most part I dont really raid, a main reason is my hesitation at entering content that I dont really feel ready for. I've parsed myself a few times and have always been struck at how easy it is to lose a lot of numbers to easy mistakes and fat fingering buttons. While it can be very jarring to see at first, it did help me focus since it gave me a numerical representation of performance. I could see a direct connection between missed mechanics in simple fights and dropped DPS. I know that there are people who like to use this feature to lord it over others. But I dont see anything but a tool for reflection when we talk about a personal, private number.