Since rB8014180720d8, all paint modes support orbiting around last stroke, so [a] the comment there is out of date and [b] the fallback case of orbiting around the center will never be used (unless there is no stroke information - but BKE_paint_stroke_get_average handles that anyways). Spotted while looking into T101766. Maniphest Tasks: T101766 Differential Revision: https://developer.blender.org/D16779