How does SE justify these ten min enrages, but doesnt let anyone know their dps

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If people in your group are not pulling their weight, talk to them.

How will we know who's not pulling their weight? Without a parser?...

How will parsers help increase skill when they encourage slavishly following specific rotations and timings - effectively painting by numbers? That reduces the skill needed to that of memorizing a routine and never deviating.

Are you claiming you have not memorized your base combos? Or do you relearn all your abilities on the fly each and every fight? If anything, parsers let you try different strats every fight to see how your damage compares.