The Actual Solution to the Mentor Roulette problem

[Kurando]

1 - Remove EXs. They were never designed to be done with DF randoms in the first place. Sure you can straight up overpower the easier ones like Bismarck with those 100 extra ilevels, but Sophia, Shinryu, etc? Never going to happen.

But they were designed for DF though. Just because NA/EU prefer to use PF for Ex Trials, it doesn't mean that's the only way it should be done. It's still common for JP worlds to use DF for such things, and besides there are still many new players who continue to queue up this way (regardless of region), and Mentor Roulette helps them to matchmake with a party faster.

Edit: The ARR Ex trials are usually quests as well and will appear in a player's journal, i.e. "Use the Duty Finder to confront Garuda in The Howling Eye (Extreme)"; it does not say oh this is really hard content so only use the PF to complete it.