Simply. Depends in what you understand the limited building quest to be. My take the LTB quest is associated with goals and rewards. Reintroduce the buildings would not add those goals again.. Meaning those who got them in the original time achieved the limited time quest. For everyone else it's just another building and allows further raid options. That has to be good for all players... I've been in the game since the early days so it's not great shakes personally if they are or aren't released...

Thanks CJ for the response as well.