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actually that is false. ;)

A family photo needs simple horizontal framing.

A social media photo needs to be shot from above to capture full lips and exaggerated chest.

A CEO PR photo needs to be shot from slightly below as the subject stares out into the "future" ("vision" while disclaiming that forward-looking statements involve inherent risks and uncertainties)

ok fair point but that's still like 3 dof

those arms are not cheap

Within the bounds of standard gravity you can get the vast majority of shots with 2, Z and elevation but this assumes the subject is in the right place. The idea here is that it doesn't need the person to be in the right place so you need 5dof, might as well have 6 for artsy stuff.

If you do video, it helps to have 6dof to simulate a camera rig (snorricam)

https://en.wikipedia.org/wiki/SnorriCam

Because they had one, and robot arms are fun to play with.

https://www.photorobot.com/robots

Looks like maybe different configurations based on customer needs?

That's an unrelated website. The paper is here, and called PhotoBot: https://arxiv.org/abs/2401.11061

Oh thank you!