Safety factors matter in bodyweight training equipment because the user's body is the load and the support system has to hold that load reliably. A pull-up bar, suspension strap, dip station, ring mount, push-up handle, slider, or ab wheel can fail the workout if it slips, shifts, tips, pinches, or overloads a joint.
Good safety evaluation looks at more than the exercise. It includes load rating, mounting, surface grip, clearance, hand position, range of motion, skill level, fatigue, and whether the user can stop the movement under control.