I'm guessing you haven't been on WoW in a while?
Any content prior to the latest expansion is level-scaled. However, the scaling is such that low levels are effectively, in their one- to three-button spam, supercharged as if benefiting from a level capped player's full toolkit's worth of cooldowns at all times. "Damn, you're putting out numbers like you're still level 10" would be a complement. Except, people don't really talk about numbers. They didn't much before, as they were useless without context, and they certainly don't now, as scaling has made them utterly useless for figuring out performance during leveling unless one is familiar with how much that spec can put out with X relative gear at Y level across Z number of enemies.
By the time you get to upper content, such as Mythic+ (which caps its rewards at level 15 but technically continues upwards indefinitely, and is presently nearing level 30 for the world's best groups), parses still play very little part except in informing tanks of safe pull sizes when working with PuGs. That aspects has been replaced, ultimately, with Raider IO, which is essentially a sum of dungeon difficulty levels cleared. If I want to see who to invite to my +10, I look for those who have timed at least an average of +9, which is what raider IO then tells me (though it's rather more lenient and granular than mere pass/fail checks). That's it. In difficult content, there is literally no way to replace someone anyways, and the parses are irrelevant outside of specific contexts of comp, tank style, party ambition, dungeon, difficulty, and affix, so you just go by what people have done so far.
Please don't take this as a wholesale defense of M+. There's a ton wrong with it, especially in terms of creating unnecessary points of conflict among players. But parsers at best form some manner of explanation for why someone left a failing group (e.g. repeatedly wiping to what should have been an easy boss or taking forever on would-be easy trash) after they'd already left it. They do not influence your joining a group (they've little correlation to success and are entirely falsifiable) and they do not influence your remaining in it (because you literally cannot be replaced anyways).
And for anything under M+ difficulty, your relative throughput scarcely matters.
Raids, meanwhile, are no more likely to check your logs until Mythic level than a Savage PuG would be here, and certainly will not accept, let alone require, a screenshot of your parses. (And, as mentioned before, fflogs (and warcraftlogs, for that matter) do not need live parsers to operate; they are a separate technical matter, even if they may share "parse culture".) Rather, they will simply look at your ilvl, whether you've completed at least up to the prior boss, and compare those two factors against competing candidates.