If running a parser makes you cynical and depressed, why do it?

[Goji1639]

As I said: I'm okay with DPS having less responsibilty.
I'm also okay with new players needing to learn and therefor missing crucial aspects of their rotation while learning and improving over time.

I'm not okay with this attitude of "lol, its only a leveling dungeon, as a dps I dont matter anyways, just here for fun, dont care about anything" which you seem to love so much.
Why is "being serious enough about content to follow your rotation and make proper use of your toolset" such an un-fun and terrible thing to do? How does one play solo games with that attitude? Or does one simply not do that because they'd get stuck after the tutorial and has to fall back to a game in which other people essentially play it for them?

I'm well aware that you're not OK with new players just wanting to have fun. Fortunately for them what you're OK with isn't what determines what they're obligated to do and what they're allowed to find fun. The story dungeons are scaled as they are specifically so new players can be "just here for fun," and the content will still get done without issue. That's an option SE wanted new players who are only really interested in the story to have.

Not everyone has the same concept of fun that you do. So, your best option is to accept that, take the rewards that SE gives you for running roulettes with "those people," and go about your business without any impulsive need to fix other players unnecessarily.