I can't speak for elemental or mana data centres, but I will talk about Gaia where I am from. Trolling premades, virtually unheard of here. Majority of attempts are pure PUGs during peak hours. Premades usually limit themselves to 1 or 2 groups of 8 - mostly tanks and healers in order to ensure enough for a full run. Inside the arsenal they will split up to ensure each team has enough tanks and healers. They are aware that having a premade of 48 - 56 is exceedingly difficult to get together.
In all runs that I have seen, parties usually form while waiting for portals to stabilize, or once people get into the arsenal. For those wondering how pure PUGs actually have a decent chance of success here in Gaia, it's not that the JP community are better at pugging(never played in NA/EU or Tonberry, so I can't compare), it's not that majority of non-JP on Gaia are fluent Japanese speakers (although in Alexander, non-JP who are not fluent are a rarity); the real reason is the innate culture. I believe majority of players in EU/NA/JP are just normal folk who want to achieve an in game goal, whatever that may be. However, innate real life cultural differences affects the general culture of their data centre and by virtue of that - how they view and interact with their community. Recall how JP in FFXIV quite reliably do duty finder runs for savage raids and extreme primals. We have macros with very little deviation from the common strategy.
Same in the arsenal. We expect first timers in each run. We are willing to teach. First timers speak up, we post the macro, give them a few minutes to digest it, place markers then ask if anyone has further questions before the boss is pulled. People tend to follow instructions to the letter here. As long as it's close enough to the standard accepted strategy, obey the macro posted, do not question it. If both sides have agreed to pull Art and Owain at ET19:30, people obey it and don't question it. Maintaining group harmony matters a great deal in Gaia, much more than personal achievement. Not because we are selfless, but because this is an mmorpg, we can't achieve most of our goals alone. The ironic thing is that a lot of the macros for raids etc used in Gaia, are translated from NA/EU strategies.
Gaia's culture is that "everything can be pugged successfully". We may never be world first but we still clear eventually. A friend from the same server (Alexander) cleared her ultimate weapon ultimate a couple of weeks ago, after months of pugging learning parties at increasing stages of progress. So when we look at the arsenal, we say to ourselves, "looks a bit daunting but I can pug that and clear eventually." People in Gaia don't really have strong feelings about most content, we either do it or ignore it.
I have never seen people not help the support fate. I hear or read that on Elemental or in NA, people do that. Do they really? In Gaia, we help the support fate without fail, for many reasons. (1) One day it may be our own turn in the arsenal, (2) need the exp to level our EL, (3) collecting lockboxes and crystals for a relic weapon, so why not? It is still an EL 60 NM equivalent. (4) they want to be in the final 8 to fight absolute virtue and ozma. Few, if any premades at that point, so first to a portal gets in. No hard feelings, just try again next time if you don't get in. Cheer for those who got in; what goes around, comes around.
Notice that none of the reasons are altruistic. We in Gaia just recognise that it makes logical sense to cooperate rather than be spiteful.
I see a lot of negative comments from NA/EU/Au/Nz, (much more than the JP and non-JP from Gaia) it's fine to dislike things, but is it really that difficult to cooperate with most of your data centre without forming premades?