I don't have companions jumping off high cliffs and causing themselves damage. I don't have companions constantly running into lava and dying.

I don't think that's a matter of what angle I keep my camera at. I just click for my main character to go somewhere, and the others follow. Without jumping off high cliffs and hurting themselves or running into lava.

As such, I wonder. Why are other people having this problem? I understand it happening a couple times on accident, which can be frustrating, but to say it's a common experience? An "often" experience?

This is not a difference in play style. This is either hyperbole or it's a platform issue.