Honestly, I can see the benefit to individual players to have a built-in DPS meter, that could even rank you the same way FFLogs does, but is completely private. It would tell you that there are improvements that can be done, though it may not be evident what you need to do, it would be a starting point of "Oh, my rotation isn't optimal, time to look around and see what would be better/help me improve".

On the other hand, if is isn't private, I can see people kicking others from parties before even going into any content due to their numbers. Or, even if it is private, kicking people who don't want to share their numbers with others. It could lead to a fair amount of discrimination, especially when it's found out that someone lied about their numbers just so they wouldn't get kicked.

I really don't care that people do parse, because it doesn't really affect me as an average player since I don't do savage/ultimates, provided it's used as a tool for self improvement/helping those on console - like myself - know where they need to improve(without harassing them of course).