This right here. Every single word of it.
Personally, and I know it's a bit different but - I'm stuck on Ravana Ex. I watched videos, I even read a guide - I tried to make sense of them. You know, to have that entry requirement checkmark ticked off, even though it didn't make any difference, because I had no grasp of the fight itself. I could get in one learning/clear party, and we managed to beat it down to about 20% before people had to leave. (Actually, there was one tank the second time who joined, and then when we wiped once, he left, saying he "didn't expect having to teach" or some such - even though the description clearly stated "clear party" and that it was to try and get that clear. So yeah...) It was good practice, but I still can't say I actually know the fight. And since then - nothing. I watched learning/clear parties pop up very rarely on PF, I even joined some of them - and then saw and experienced them being disbanded before being even close to full, after more than an hour (yes, being put up there several times), because nobody was joining in. Frankly, in the ocean of LFM/LFG ads that demand things like "please rate at 1.1k+ dps" and "be able to oneshot" and "no unsycned and minimum ilvl sync git guud to kill" - I applaud the bravery of those who even dare to put up ads for practice parties. And then of course all those people whine and complain about there being no "decent" tanks or healers or dps anywhere and how everyone is a "scrub" and how nobody can play their job "right"...
I don't even know why refusing to give a short summary, especially when it's known that there is at least one new person in the party, at the start of a fight is so unacceptable. Especially when there are multiple ways to do something. Everyone just expects everyone else to know everything, to be able to do it in their sleep - and then they complain when somebody isn't like that. Perhaps because that someone is new.
And this is why I also agree that it's dumb not to have something unlocked in DF. If you have friends to help you out, you join up with them anyhow; if you don't, you're joining a bunch of strangers either way. You might get the content done or you might not, both are just as likely outcomes. Not having something unlocked for solo queues in the DF does nothing at all except for alienating and locking out a good chunk of people, for no real reason - and then these same people, many of whom would be very much capable of "getting things done", are mocked and get labeled, months later when the content is question is unlocked in DF (perhaps even nerfed or echo'd) and they finally get their clears, when the truth is they just never had the opportunity.