Its called group responsibility. A dungeon requires teamwork and cooperation from everyone in the group in order to pass. When you decide to join a dungeon, in the Duty Finder, if you do not already come prepared with knowing what your responsibilities are, you need to be able to learn or communicate with your group to do so. This wasn't happening here.
You seem to have a point of view that everyone pays a subscription, so they can be a unique snowflake and run the dungeon however they want, don't need to listen or cooperate with a group, its their entitlement to get carried through a dungeon. I'm guessing the game is more of a social focus for you, or you may be into RP, or crafting, or other type of activities that do not revolve around dungeons. When you are doing your crafting, you can choose exactly what you want make, who you want to deal with, 100% in your control. You can choose which FC to join, which Linkshell, which friends to have, what RP to do, anything and that's all fine. That's what the game is for, there are no rules really. However when you choose to join a dungeon with Duty Finder, its not my responsibility to do your job, it is not your entitlement to get a free run through a dungeon handed to you. You need to participate/learn/communicate, it is your responsibility to play to the best of your abilities. To be honest, I don't really mind carrying players when I do, for example the BLM in AK this week who couldn't seem to make it to fights, or would afk and get "locked out," we killed the boss 3 people without him, and no I never vote kicked him. Or to the BRD in WP who I am doing more DPS as a tank than with multiple lvl 30+ items. I don't kick these people, I just plow through and get a win, and drop party. However in Pharos Sirus, I can't carry a party that can't learn job roles because it is a harder dungeon. I think a lot of DPS are just used to being carried, and they get to a place like Pharos Sirus, and their mind is blown when they have a responsibility/ Every lvl 50 BRD gets an interrupt skill, I'm not asking you to be full ilvl90 gear, I'm asking you to cast your skill at the appropriate time and communicate with the groupand I know you have interrupted before since you did your class quest.