Ex trials need to go. No question there.
Imagine playing on the EU datacenter and getting people who cannot speak English, the auto translate function is not advanced enough to explain the mechanic of an Ex fight.

Also to expect Mentors to know every single ex trial mechanic is a bit much, I know carrying the "crown" comes with certain responsibilities but the amount of stress is not worth the effort.

Also I do not trust randos to learn mechanics in a reasonable time frame if half the time I queue for any dungeon I get low-effort people who don't know how to play their job. 90% of people that use df for ex trials have probably no idea what they are doing.