I know in my shell, we take our time to master each end-game encounter. Some shells are ok with spamming one dungeon or primal over and over again for 16 hours straight for days on end until they get it. We don't, we spend probably 4 hours max on one encounter so that nobody gets burned out. Because of our approach, we've gotten behind a bit. Most players in my shell want to master the older content, and get geared up from doing so, before making any serious effort to take down Garuda. I can't speak for everyone, but since the BLM burn was the easy way, I'm guessing other shells basically have the same thing in mind.