Sort of happy story. Trying to clear old content on my alt (currently a lv 74 WHM slowly getting through ShB). Tried to get all the 24-mans done yesterday (the ones I had left at least). Dun Scaith went fine, just long wait time. Rabanastre was fine too. Ridorana was a slight struggle, lots of newbies, lots of failed math, one wipe on last boss, still fine though. Then Orbonne... Zoned in, half of alliance C left instantly. Ok, we can still do it. We somehow clear Mustadio. Some new people join, more people leave. We wipe on Agrias. Everyone leaves, vote abandon
Second try! Again, half of one alliance just leaves instantly. We clear Mustadio with one tank and three healers, I'm struggling so much to ress the summoners and red mages in the healer less alliance XD (any tips on how you target people in other alliances on PS4 with controller...? Using the touchpad was not very efficient...). We clear. Somehow. More people leave. The only tank left refuses to give up. We get some new people. Agrias is still a struggle, but we make it. Barely. Since Agrias takes so long, all alliances fill up!
Surprisingly, Thunder God and Ultima went just fine! Some derps, but no wipes. Had to do healer LB3 on Ultima, but that's ok. My healer partner said they had tried 7 times to clear, but every time people left after Agrias. Lots of people got their first time clear, it felt nice

Reminder to people to don't give up just because you get Orbonne in roulette. It's very much clearable. Even with 50% or more new people.