The way Tera's lockouts worked was so bad and wonky.

You could only attempt Argon Queen, win or lose, about once a day. This made it so people only ever wanted to do Queen with people who had already cleared it. If you weren't attempting Queen on day 1 of it's release, you were SOL. Nobody wanted to waste their lockout on teaching someone new how to do Queen, especially since Queen had some mechanics that would make your average FFXIV player cry.

They later released a "Queen NM" which slowed down some mechanics so you could learn which didn't drop loot, but for some stupid reason it still had a lockout which completely defeated the purpose of using it as a practice mode for the real "Queen HM".

Tera's endgame was stupid. It's hardly a model for raiding in any MMO, period.