I disagree. I think it would behoove you to form your own group or join another with like-minded players who intend to farm these dungeons, and who know that skipping cutscenes will help you do that faster. The developers aren't forcing anyone to use the Duty Finder to pair them with first timers.
And the devs aren't forcing any first timers to hit it up either. It would behoove them to find a group that wants to experiment as they go.
We can talk a lot about those few, rare, perfect innocents who have never opened a forum thread or listened to shouts in Mor Dhona while they were gaining five levels there, but really by the time you reach CM you should have absorbed a few things:
a) Some people have run dungeons a lot more than you.
b) Some people have never run them.
c) There are tricks to each dungeon that aren't immediately obvious.
d) If you don't know them, asking makes things a lot smoother for everyone involved.
e) If you do know them, teaching makes things a lot smoother than everyone involved.
f) Some people insist on a very fast pace, and some people insist on a very slow one.
There's room for a very obvious compromise here of speaking up at the beginning and dropping if the party you get gets abusive or can't find a middle ground. The entire multiplayer section of the game has been about teaching you to do this, and it should be the culminating point of your people skills along with your technical execution and the plot itself.
If you -can't- reach an arrangement that works for everyone, bow out, or accept someone else bowing out, you're just showing a complete lack of respect for the rest of your party. And this holds true whether you're being an ass and charging headfirst into fights before the rest of the party is ready, or being an ass and going silent/motionless (which punishes the whole party!) because someone rubbed you the wrong way.
Honestly, I'm not sure why people have such a hard time either way. I've seen the first category never (other than speedrunners trying to execute a different strategy than -other- speedrunners), the second category maybe twice, and most cutscene sets are pretty perfectly timed to type out an explanation for the new players in the group.