I think they should still force level caps, or at the least give the option to level cap yourself to the intended mission level. This way new players or returning/older players who want to experience the missions for how they were intended, have the option to do so. Right now, its so easy to level up that when any new player reaches these missions, they will simply one shot the NMs. It takes away all the impactfulness of the story when you go through one shotting everything, especially for the first time. Added incentives could be CP, various items, etc in order to get people to help the person on the mission or I'm pretty sure every mission can be done at level cap with trusts easily.

Just my two cents.