Honestly, trusts and other such AI partner type content should only be for things that are required for the MSQ with the exception of the Crystal Tower series as those alliance raids are done fairly frequently given the fact that there are enough players who do the Alliance roulette that cheese their iLvl to get one of them.

Extreme Trials are not required to be done for the MSQ. Therefore, I do not feel like they should get a Trust/Squadron system.

And this is coming from someone who always attempts to do the dungeons with the Trust system before using the Duty Finder.