Gated Content: content in the game in which you put a series of quests, or requirements before allowing access to said content.
At first pass through this game, I felt that having your quest chain lead into instances was a very cool idea... and it was actually very easy to get groups to complete content. And then the 8 man content hit in my story quest and suddenly I saw incredibly wait times and not being able to work my way through it. I can actually see now what a completely terrible idea this was and suddenly I'm brought back in time to days of old where you had to do painfully long quest chains to get Keys to be able to enter instances... and complete sets of resistance gear just to advance further in the game.
Defiance also ran into an issue with gated content which I saw in week 2 of their release... and then I just closed up the game: not worth it.
I'm also at that stage right now with FF14. I think that if you took an honest poll and asked players if they prefer an "open sandbox" type access to ALL content vs gated content you would find that the majority of your playerbase doesn't want to be stuck endlessly assisting guildies with content that has no meaning other than to become "unlocked" in a quest chain... they get zero benefit running people through that content.
It's a major under sight in your game. And I'm pretty sure I'm not tolerant enough to sit around endlessly waiting on 8man groups to be able to see the end of my story and then "unlock" even more content to play as a level 50.