As for citing empirical evidence, it would be me grinding 2000 Mentor roulettes and all four 900-duty tank achievements, while spamming Trial/Raid roulettes for second-chance points. It's also the stream of threads that keep bringing this up. I would argue this supersedes all the unsupported contradictory claims about the roulettes that do not align with how they really operate.
The point is just that: there are too many conflicting points. It's usually when Crystal Tower is brought up that the argument shifts.
"Roulette can pick any duty, good or bad."
Even though it allegedly (and empirically) prioritizes certain duties. Not that there should be any "bad" duties anyway.
"Roulette prioritizes first-timers."
Even though they're frequently absent, especially in the latest raid tier because tokens.
"Roulette prioritizes people in queues."
Even though people have complained about sitting in queues like Ridorana for hours, and the roulettes love to grab a full party of rouletters and throw them in a duty (including ones nobody would queue for) after a very short period of waiting.
"That's because people only have Crystal Tower unlocked and the roulette prioritizes lower-level alliance raids!"
Then it is fundamentally flawed. Even if the latter part is true, it would be more logical to start from the higher-level duties and work down.
"BTW, people are manually grinding Crystal Tower...also, relic steps."
Which does not give the roulette bonus and is irrelevant to sprouts/first-timers going through the MSQ. And a roulette should not be influenced by bots: do they count as first-timers or people sitting in queues? Also, if people are deliberately grinding CT, they would not blacklist them and (in theory) lengthen the queue times.
The Mentor Roulette also compounded these issues. It would either "help sprouts/first-timers" or "fill queues" even if those contrast with each other. And yet it's possible to get thrown in Praetorium with three other trade mentors, and a good chunk of the duties are worthless guildhests.
I'm less acquainted with the dungeon roulettes and they seemed better in those regards, but there were people complaining about the level-cap roulette picking the same dungeon, even though all the dungeons are valid choices.
I was in favor of diversifying the roulettes, giving the ARR/HW duties proper potency adjustments, and throwing the Coils in there. It would expose many people to fresh content and probably solve the Crystal Tower fatigue.
