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I learnt a lots, for instance, with power armour, you can jump at any height and land safety.
Jump off the Prydwen for instance is doable, and higher height is possible (I learnt that from a terminal in the lower desk of the Prydwen).
Upgrade your science and armourer too, you'll get some pretty awesome upgrade to the power armour that make it so much easier to explore the wasteland, for instance you can upgrade the light to a brighter one, or increase carrying capacity.
The most important perk is the Strong Back perks for those who love settlement building, if you upgrade it fully, not only you can fast travel at any location while over encumbered, you can actually still run as well making it a little less of a slog, but that used up your Action Point (upgrade your Endurance helped too).
Plus;The biggest advantage is that if you want to build another settlement but all your junk is in your original settlement, you can simply carry all the junk, fast travel and deposit it in the new settlement, especially one without many resource to begin with,
However, once you get the Castle, try and get as much concrete as possible so you can rebuild the wall;