The thing is that it could hardly be considered as abstract.
The pip-boy is a lore-wise device, actually offered to you by an actual character, and referred by many others.
So the buttons and options should be considered as the actual buttons and options of the device.
Many of these options makes sense and are aknowledged by other characters.
For instance, you meet Reilly rangers in Underworld and she ask you to rescue her friends.
By looking of your DC map, she is able to add the coordinates of the location in which her rangers were last seen, so you can save them.
You know where they were, but not if they're still alive, and not how to go there.
Afterward, you can sell information from your map to Reilly, so the device is fully aknowledged once again.
But not all quests provide you enough information to add the coordinates of your goals into the Pib-Boy.
Also, the instant-travel button, not only does it prevent dev for thinking of better way to handle actual fast-travel (by car, train, caravans, other transportations), or put more carefull thought on the local areas, and their relationships with each other, but also works as an in-universe instant travel system, as you can end up in some locations, in the same time or even before some npcs you seen leave before you (Mister Crowley toward Fort Constantine, Dad toward Rivet City, slaves toward Lincoln Memorial), by only pushing a button on your device.
Yet, your father, that have the same device, doesn't bother to use teleportation when he leaves vault 117, and nobody seems to aknowledge this ability.
Sometimes in the devellopement process, they clearly mixed up a lore-wise device and a gameplay feature.
PS: I also find convenient to teleport in places i don't want to go through again, but the cost for that feature is too high, at least in the way they implemented it.