Your notion that FO4's Commonwealth has no history to it is completely ludicrous.
... has no history? no one said that! i didnt say that.
How is there no or little story or information about the Commonwealth in FO4? You enter it abruptly after exiting Vault 111. Then you go out discovering things as you go along. Whether you follow the breadcrumbs of the main storyline or "just go some direction and run into something," you'll find out more and more of the Commonwealth and it's history. The game world offers tons of bits of history for you to discover.
You find out about the Minutemen's former standing in the Commonwealth and their colossal downfall and fragmentation. You even come across Raider groups that you find out WERE Minutemen and find out why.
You find out about Diamond City, it's importance in the Commonwealth, and a whole slew of things that have occurred there even before your character emerged, as well as setting in motion other things related it.
You find out about the presence of other powers like the Brotherhood of Steel, Railroad, Institute get familiar with their history and what they're trying to accomplish.
You find out about "The Synth Threat" and the fear, danger, disappearances, infiltration / replacement of real people by them, and settlement wipeouts from them.
this is all from the main plots of the series that you run into simply by playing the quests.
The game is filled with lore, history on Boston before the bombs fell. Whether the source is from someone like Nick or things you discover from adventuring.
this is the part that is lacking. you dont know much about the area prior to the war. you can say you do but it isnt true, you dont learn much. most locations you can find (including unmarked ones) do not provide any information towards the lore or any actual value to the game as a whole aside from finding some minor loot.
what story is there has so far (for me at least) has been very boring and lacking. it is neat to see the tie ins with FO3 but the substance isnt there. it's like eating a grilled cheese sandwich, sure it can be good but it isnt that appealing by itself. the game, as i always say is good, but far from great.
Lacking of knowledge about the Pre-War era? Dude, have you even gone adventuring? Nick's storyline and so many things about it have heavy ties to the Pre-War era from a Detective's POV, dealing with organized crime, a snapshot of a Pre-War setting that wasn't all about the war. The Glowing Sea is a huge collection of information and sites when the s*** hit the fan. How are you not finding this?
You complain about the lack of history, information of the game world / setting, then toss aside the idea of getting this information from your adventuring? You use FO3 and FONV as examples with information being left for you to discover, but when it happens in FO4, it doesn't count?