... You don't even do this mission for 3 of the 4 faction routes... you realize that right?

Unless you get kicked out of the BoS, Institute, AND the Railroad the game's story won't even take you to the Castle at any point. And they include it cause it's fun MF

Where else would I display my personal collection of all the power armors with each custom paint job?

How else would I make my conveyor belt that dupes any item I tell Dogmeat to fetch off it??

Bethesda games all about the different avenues for fukkery breh