Just going to point out that in Fallout 1 you are GIVEN A LOCATION OF ANOTHER VAULT TO CHECK OUT IF THEY HAVE A CHIP.Sure, but the way those storylines are structured exploration is organically integrated to the game's core. You don't know where the water chip or GECK are, you don't have anything besides a couple of pointers to go. Finding the things requires you to explore of your own volition, and across the way find out more about the world. Hell, the first game even has a time limit, and many people hate it, but it works well make you feel the pressure and get invested in your quest. As opposed to F4, where you are basically given your lead from the start, and all you have to do is follow it.
It's certainly not 'volition'. Or any exploration or talking to people. The Overseer gives you the lead before kicking you out. Its a direct lead that is way more useful than in Fallout 4. The lead in Fallout 4 is 'go talk to the detective because.... he's a detective. You know, a person who investigates crimes and missing persons.' What a lead...
Anyway, here's your start in Fallout 2. Way more obscure. But at least you told of the potential location but you need a map off a trader
Where as the people you send you on your way in Fallout 4 have no idea your son is in the Institute and just send you to Diamond City to find out