despite the growing blind spots, if you back out slowly, the oncoming cars will see that and react.
They may, or may not.
If they fail to react and run into you, the car that was backing out of the parking spot unsafely (yours), will be at-fault for the accident.
Today, every human backs out of a spot blind. If you have a rear passenger, with their help you are less blind. The rear camera is like the ultimate rear passenger - they're as far back as you can go. Which is why I think I'm much safer relying on the rear camera view than looking back.
It all depends on particular car's visibility out of the rear window vs. rear-view camera's angle.
In most German cars, and all rentals I ever drive, I find that relying on looking directly out the rear view window is the best and the safest way of backing out: partly because visibility is really good (German sedans), partly because I don't trust a random rental car's camera.
In some cars, like minivans, rear viability is total crap, and you can only rely on rear view camera and rear radar with cross-traffic alerts.
In a Model 3, rear visibility is sub-optimal. So the only practical choice is to rely on the rear view camera that has limited side view depth, and no cross-traffic alerts. Not great, but tolerable.
And the same reason I think FSD backing up will be safer than a human backing out.
Not without rear radar that gives cross traffic alerts capability (most cars!), and not without side facing cameras in the bumpers (most German sedans)!
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