But thats an outlier, the reality has many more variables.
Realistically, i very rarely pug, might have literally pugged someone for M+ maybe 20 times in 4 years that it exists as content.
I remember 3 of those times, 2 in Legion, 1 in BFA that i picked "good early Mythic progress , he cant be that shit", and all 3 times they were absolute shit, for my standards, i expect someone that has such progression rather early in the tier to know how the fucking dungeon works, what to interrupt, when to do what and how to survive a bursting and similar shit, generally, play the fucking game properly apart from "Dodge the red fire".
And by good Mythic progress i mean something thats actually decent the second/third week the raid is open, as example the BFA one, was a DK alt, with mains progress at Mythic Mekkatorque the second or 3rd week of Mythic BFD if i recall, so they were stuck at Stormwall probably.
Said DK was also decked out in HC BFD full clear gear etc etc, sure his single target DPS was decent, but his overall was horrendous, his overall knowledge and performance was horrendous in that Waycrest, considering he got overall outdpsed by the 3rd alt of a HC-only raider and barely overall outdpsed one of the worst players in my HC guild, my BM hunter gf :P
"He would probably do better on his main if he was an alt", can be used, thats its a cheap excuse you know, you expect better quality from such players you know?
He was an outlier too, but you get the point of my post.