system
Given the following post, respond as if you're commenting on Reddit:
human
[Fallout] How important was the Pip-Boy to the success of the greatest figures of the wastelands success?

Numerous figures have appeared since the bombs dropped that have proved overwhelmingly influential in the grand scheme of things. The Sole Survivor, the Lone Wanderer, the Chosen One, the Courier...

All of them had a Pip-Boy. Could they have done what they did without one?

Ignore situations where it was objectively necessary, like using it to open Vaults in 4.
gpt
It's hard to say how much of the PIP-Boy's interface is "real" and how much is a gameplay convention. 

For example, in game you can change your character's clothes through the PIP-Boy menu. In-universe, however, it's unlikely that it can make an outfit instantly appear on you at the push of a button.