The difficulty curve in the game has... problems...

[Issaella]

There is nothing to lead in any PF.
Creating a party doesn't mean you have to do call outs, answer questions, be ahead with mechanics, offer advice and corrections, provide macro or markers or anything of that sort. All it means is that you can set the requirements as you desire (ilvl, classes, other options, description) and have the option to kick someone if they don't perform according to the standards you set.
Many people creating a practice party in PF don't even have markers or a macro or any clue about what's going on. They just created the party, that's it. And nobody expects anything from them.
You just set it to "practice", uncheck "Duty Complete" and "Duty Complete (Weekly Reward Unclaimed)" as these two options prevent people without a clear from joining, add "helpers welcome" and "bring macro/ markers" if you don't have but want them and you're done.
Once you're confident with certain mechanics you add "from mechanic X onwards" next time you set up PF.

I'm going to be frank, why would anyone join a party like that? It would have zero chance of success or progressing at all? It's not only wrangling a group of cats, but it's essentially say "f' it let the cats run around and do whatever they want". If I were going to join a PF group for prog for p2s then I wouldn't touch a group like that with a ten foot pole. It would in no way assist me in gaining experience or knowledge. I would expect that someone leading a group would at least have some idea what is going on and how to help with issues beyond just hoping more experienced people can join and sort it out.

All these misconceptions you have come from a lack of experience but clinging to them won't help you. Why not believe people that are telling you otherwise from experience and be glad that it's not nearly as gloomy as you thought it to be and give it a go?
I created plenty of parties during my 1st tier in ShB, it's not complicated and nothing was expected from me because creating a party doesn't mean anything. And there are plenty of "7 other people" out there who perform the mechanics just fine.

My experience PuGing Unreal on my alt would beg to differ with you. Having it on farm on my main and then trying to PuG it exclusively in Duty Complete reclear/retell parties on my alt is frequently infuriating. And that is only in groups that everyone has ostensibly cleared the encounter before. That is really what I'm basing a lot of my trepidation on truthfully. If I can't even expect baseline competence from people that have cleared something not to make everything miserable/harder than it has to be, then what hope do I have for Savage? And I am by no means exempting myself, who has no experience at all. And compared to Unreal/Ex the margin for error might as well be zero.