Echo Spectate / Gobbie Training Grounds
With the addition of the Stone, Sea, Sky this upcoming patch as a kind of "Test your Strength!" raiding prep tool, I was wondering whether it would be feasible to have a kind of spectate option for the end game raids and trials. Like, say it's a dream or astral projection afforded by the power of the Echo that allows you to be "present" during another party's fight without actively participating. I would allow that such a thing could be made invite only, the option to suspend chat from spectators, and a limit on the number of people who can spectate. It could be useful for people who want to learn the fights without necessarily feeling the pressure of being the weak link.
Alternatively, you could have a kind of "training ground" with mechanical dummies (I'm imagining in the steampunk style of our favorite Gobbies) reminiscent of end game bosses that simulate their attack patterns but do little to no damage so people can practice avoiding attacks and learn what to look for. You can institute this method three months or so after any major new content is released to give hard-core raiders time to complete the content on their own, and lore-wise you can say that the Gobbies were able to construct these training grounds due to the advice and feedback of daring adventurers who have survived these encounters (maybe even reward world or server firsts with a shout-out somehow, like in-game representations of their characters in the background, or some kind of memorial wall).