There are some fights that aren't possible unless most of the party is at least half decent.

Even with the Echo on Titan EX for example, if you have a party that has 4/8 players get knocked off by landslides in the first minute you'll see the other 4 just up and leave right away because there's no hope with that many bad players, no matter what Echo bonus you have. That's not an elitist attitude. It's a case of there not being enough competent players in the group to carry the incompetent ones.