I think a big problem with these "Walking Simulators" that I don't feel like anybody has addressed particularly strongly about is the fact that they just have weak stories.
I mean, if we wanted to break down a "video game" into its core components, we could say: The Gameplay (what the player does), the Visuals/Audio (what the player sees and hears), and the Story (what the player experiences).
These Walkabouts aren't about gameplay, so that means in order to create a good one they would need a strong Visual/Audio and a, stronger still, Story to support the missing leg. Of course, many of these are made by tiny groups (one person?) with nearly no budget, so the Visual/Audio is typically going to be weak as well.
...and all that leaves us with is a table with one leg - the story.
Yet, at the end of the day, the stories these games deliver are fucking SHITE, if they have a story at all (a legless table?)!
When the story is the focus of your work, and you have no real visuals or gameplay to back it up, then the story needs to be good. And I mean REALLY good. Not a 5 minute teen angst drama. Not 2 hours of non-sequitur dialogue that leaves the player with more questions than when they started. And, seriously, if your game has no gameplay, the visuals and audio are all free assets from the unity store, and you didn't even write a story, then sod off; your game doesn't even deserve to be called a "Walking Simulator." Maybe a Scam Simulator.
A game like Dark Souls have a Q/A team and play-testers whose job is to test all the equipment, fight all the enemies/bosses, etc, in order to find bugs, glitches, and gauge the balance of the game to determine tweaks to improve the experience.
What these Walk-Abouts need, and currently lack, are editors, and people to "test" the script. See what makes sense, what doesn't, where this bit of story could fit better into narrative they've created. Writing is hard, and I don't know if the people who make these games even have that much experience with it (this is getting too far into the assumption territory, and I'm already behind enemy lines).
Right now, their stories come on as pretentious, if they're even coherent, but I believe people would warm up to them if they had a strong script to engage the player in lieu of gameplay.