There are usually plenty of "blind run" parties in PF, particularly for extremes. Usually if you don't watch a guide, someone just explains what to do for each cast that is causing wipes or shows what to do using markers as an example.

In rare cases, it can be too difficult to explain an extreme trial mechanic without at least linking a website strategy planner or other diagram. Tsukuyomi is an example.

Even people on day 1 often have to playback a video of what they did in slow motion to figure out what's going on. Sometimes you just can't tell how a mechanic is happening while actually playing and need to play it in slow motion and pause it at various points. And sometimes they need to review multiple pulls to come up with a diagram of how it works so they can articulate it themselves and create a plan for it on a strategy website. All of this is especially true in Savage.

Personally, I try to do things blind first, then look for strategies or guides if I really need help. Abyssos is a great example, because the first raid that I did blind (P5S) had a mechanic called Devour. Once I got to that mechanic, I was just endlessly going into the mechanic having no clue what was going on and getting devoured. The only option was to really break it down and figure out a consistent way to avoid that whole thing so I spent a very long time reviewing videos, strats and guides for it until I was extremely confident I could do it consistently.

If I had just not researched the mechanic, I would have kept dying to devour all week and learned nothing. It just wasn't very easy to see what was going on while actually playing.

One thing I can say, is that if you set up a blind party for savage on the first hour of savage release, everyone in that party is looking at content creators live streams anyway and ignores that you put "blind" in the description, but as the party leader you can absolutely try to be blind yourself still.