help vs. ridicule is the problem. Some groups intentionally help a new guy out and more or less carry them through a dungeon to get through a story or some other desired goal, especially with FCs or linkshells. On the other hand, in Duty Finder you may end up with a bunch of veterans and relatively crap gear, and they can vote ban someone trying to get their first clear, calling them a troll.

Some trials/dungeons are way more gear than skill, but some people let their item level go to their heads and then bash newbies over the head with their "awesome skillz" which are quite often just the bonuses from gear. Frankly, I'd prefer a game with more character class/level based abilities, and less gear based bonuses, but that would be almost as hard to program as editing Echo for single individuals of extremely low level.