Some people also give bad advice too, lol. I saw someone ask: "Do I need to read or see a guide for Garuda EX?" Answer: "no, unless you are the tank, just don't kill the Spiny plume."

I think that except content that is brand new and there are no guides and nobody has a clue or nearly, we all have to look at a guide to at least know what to expect. This is group play and you can spoil other people's runs if you just go knowing nothing.

About Japan difference, I have heard in Japan they use to learn in PF and go to DF once they have enough experience, so DF parties are supposed to go well. In NA and EU usually the DF parties are for learning, and PF parties for advancing more and getting the kill. Except places that are not so difficult and you can expect a kill with more or less wipes.

Also say if you are new, that's nothing bad, and have patience and explain if there is somebody who needs it.

In long difficult fights like T5 you should expect a lot of explaining and wipes and probably just advancing some phases.