C) When you use Duty Finder, it's not expected that someone knows a fight.
This is true up to (but not including) Titan HM. At this point, the mechanics simply get too complicated for me to explain in one or two minutes (I do quick expl. regularly, but this is the point where even I give up).

It is not expected that people will skip cutscenes (which new players who wish to view them have every right to do so) .
Personally, I agree. But have you been to Castrum lately? It has become even worse now that there is an option to auto-skip already-seen cutscenes. When someone identifies him-/herself as new, I immediately apologise for what they are about to experience.