I have thought about this many times and often wondered why when closing one eye I am still able to function.
Sense then I have thought strongly that having depth perception is used for training some other part of our brain, and then only used to increase accuracy of our perception of reality.
Further proof of this is TV. Even on varying sized screens humans tend to do well figuring out the actual size of things displayed.
Some of them translate trivially to photos/TV/etc, like convergent lines or texture gradient. Some of them are surprisingly physical, like feedback from your eyes about vergence or focal distance.
Stereo is highly effective up close, say within 10 meters (yards). And it works faster than many modes. It's absolutely fantastic for catching things out of the air. Given our intraocular distance, it's basically garbage past, I dunno, 30m or something? (obviously it degrades smoothly across distance)
I've heard more than one academic (evolutionary cognitive psychologists, etc) speculate that the single biggest evolutionary advantage of having two eyes is to have a spare in the event of damage. That might well be just whimsy and exaggeration, but I think it puts a helpful alternate perspective on it (pun!).
One reason why you're still able to function is that you don't rely on your sense of depth that much these days. i.e. You don't need to gage where a spear or arrow will land. Even in a car, you are effectively on a one dimensional track and only have to decided to go left or right.
If you only had one eye, then in situations where there is lots of pressure to perceive depth I think you'd have to move your head around a lot.
Which makes me wonder, which human activities demand the best depth perception?
If you wanna launch spears or arrows, depth perception is incredibly important, but stereo vision will not help. Not with this intraocular distance, anyway.
If a person is standing next to a bush then we roughly know their height since we know the range of sizes that a bush could grow to. Likewise the size of someone like Thanos from Avengers would look odd in a documentary but because its a superhero movie we assume that's normal.
Self driving cars to my knowledge do none of this.
Driving back home with 1 eye was scary even though I was going much slower. It is possible to drive with 1 eye, but much much harder than with 2 eyes.