Why do we have to level them up? Isn't the system supposed to be available for players to queue by themselves? Right now, after finishing the MSQ, every Trust NPC gets reset to level 71, doesn't matter if you took them into the later MSQ dungeons or not and here's a bit of early math.

Holminster Switch gives them 2.5 million exp.
Every NPC needs about 14 million EXP to get to level 72.
They do not get EXP from mob kills in the dungeon unlike you.
They do not AoE (except Thancred to get Enmity).
They do not use skills while boss mechanics are going on. Even if they are safe and ranged jobs.

Now at this rate, Holminster Switch takes between 30-40 minutes to clear depending on your own performance and role. Trusts NPCs will need 6 runs to hit level 72. That means just to hit level 72, you will need to spend 3 hours to get 3 NPCs to ding. Double that amount if you want to level them all. And that is just for one level! That doesn't qualify them for Dohn Meg! They'll need more EXP for 73 but won't gain more from Holminster Switch! Which means another 3+ or 6+ hours to just get them to 73!

I think I understand the purpose of Trusts for MSQ but I am puzzled by the system in the post-MSQ game. Why gate their purpose through a gruelling EXP grind? Was it even necessary?