This is true, I guess I failed with trying to support your point by my rambling tangent.

I think having places where we can choose to impose a level cap or not (like a unique dungeon and/or old content boss fights) has the potential to add dimension and variety to the game. However, I do agree with you that level synching shouldn't need to be the answer in completing the Magian Trials. Instead I would rather see an increase in weather patterns, an increase of zones containing weather patterns, and/or greater variety of target mobs in the existing weather patterns.