t's just more random junk to find...it's all disconnected, so there's no path to follow to make a determination about linearity. It's a bunch of disconnected dots.
If you feel that a game like that has to have everything connected then i respect your point of view but i can't agree.
The random dots you are talking about - these i appreciate. (I am NOT saying though, that i don't appreciate anything else.)
Being a fan of rpg's since SNES era (by that i'm trying to say that FO3 wasn't my first rpg or anything), i enjoy immersion mostly through exploring more than anything else.
Buildings with scraps, food and water. A holotape containing some grimm story. Metros filled with ghouls and warehouses with rations, electronic parts and ammo. Maybe a unique weapon too. A base of raiders with much to loot having no relation to the main quest or even any side quests. Villages with side quests that if you rush through the main quest you won't even know they exist, and many many more.
Most of these dungeons had side quests too. Even if they were insignificant each place had it's story and interest.
As i also said, mods came to make these random stuff even more interesting for me. Adding hardcoe mode for FO3, uses for various parts such as scrap metal and many more.