Key to the Mythal end fight

[Lanadazia]

its low priority but assumeably easy to fix. remove the door, add a forcefield with swirl like in so many other quests.
sometimes its minor details that can be the most frustrating

 

[TedSandyman]

I was able to enter a few days ago by running into the door, moving left and right, and repeatedly pressing the enter key. Someone said, "Get close to the door" and I thought maybe they knew something so I started running back and forth hitting enter and it let me in. Someone even commented "I guess they fixed it.". This was after everyone was frozen and the fight was over though. Not sure if it would have worked during the fight.

 

[Lanadazia]

the point is, that during the fight noone can enter. so if it gets triggered early you might lose quest completion due to a partial party wipe.
i don't think they actively decided to make this endfight unsalvageable, cause almost no non-raid quest has a lockout mechanism like that. (nothing comes to mind, really)
if it was an active design choice, it is a very bad one, especially after a pretty long quest like that