Fallout 4 is tiny. Haven is basically within an easy 2 minute walk of Concord, at the walking pace of snail.
The automatic defense. It's packed with stuff! With detail! It's like Disneyland!
But there's no mention of how much "content" there is here. This has nothing to do with that. It has to do with how spread out that content is. Disneyland is dense because there's realworld land restrictions in place, it has to fit into a designated space. It's dense because in the real world people walk slow and get tired of walking. It's dense because you can't ride a horse or a car around the middle of Disneyland.
But video games have no such restrictions. The average walking speed, heck make it jogging speed! Could be much faster than it is in Fallout 4, because it's a video game, it can be whatever. You can give the player a horse, you can give the player transportation, you can give the player fast travel.
And then the map can be bigger, can feel more like an actual world. For the cost of a few more minutes spent in procedural generation tools, for the cost of setting the atmospheric scattering to something other than "Beijing Smog" the world could be, could look, could feel more expansive and exploratory. Could move bandits farther away from a settlement than "camped down the block". Fallout 4 is roughly the same size map as was made back in 2006, almost a decade ago, for reasons that don't hold up.
Heck if travel is boring then make it fun! It seems to work for GTA V, which is 3+ times the size, or Just Cause 3, which is 30+ times the size. Fallout 4, and even Skyrim before it, feel like a weird set of movie sets packed too close together, and video games don't have to feel that way, even if they are packed with content.