I fully support the idea of parsers for console users.

There is a huge amount of players underperforming without even knowing that they are doing something fundamentally wrong. Only parsers or very hard solo content with harsh DPS checks would potentially be able to change this situation. Very hard solo DPS checks would lock out some players from playing the game though, while parsers would just show them that there is room to improve without locking them out.
You could ask "Why is it bad that people are underperforming? The game should be fun! Everybody should just play the way they like!" and I could do little to argue against that, but from my point of view that's not what games are about. In the old days you were not able to clear a level or progress in any way if you would not adhere to the ruleset the game forces upon you. I believe that being able to maximize performance based on what the game throws at you is what makes games fun… but maybe I'm just a misguided old school soul.
That being said… if a game is designed in a way that some people are unable to tell if they are doing good or bad it's a design flaw (from my point of view). I could go on and on about why MMORPGs create this situation way more often compared to single player games and how gaming has changed over 30 years, but that's not really the point of my post.

It's a combination of personal beliefs, gaming history and thinking about what games should and should not be about that culminates in my point of view. Yeah, you can legitimately choose another point of view and honestly I couldn't do much to deconstruct something like "Everybody should be able to progress regardless of their knowledge of the game. Requiring people to read tooltips and think about rotations is too much of a hassle for most people! Games are only about fun and things like min/maxing are not fun. Games are not a meritocracy, they are only about escapism and being able to immerse oneself in a fantasy world." - since it's a possible view with a merit of it's own. It's just that I personally don't play games for that reason.

It amounts to two positions clashing with both sides covering some parts of their beliefs to get a better standing. This "game of discussion" on the other hand has some merit, too… even though it doesn't really serve the purpose of winning someone over.