beginner camera physics question

to begin with my beginner solution to avoid having the camera fall while still having rigid body physics (so that it can’t pass through things) was to create an always sensor for the camera and have it apply a force of 9.80 (equivalent to gravity but in the opposite direction).

but i noticed in the ‘simple questions’ thread that there was a suggestion (for solving a different problem) of making the camera child of an empty, which might also resolve the gravity issue.

so, i thought i’d just ask how more experienced game programmers like to set up their camera.

Why would you want the camera to have rigid body physics?