Mechanical devices, like ski bindings, can deteriorate over time with wear & age which is why the manufacturers recommend that they’re tested annually.
Not only is it important to have them tested to ensure that they release correctly but it’s also important that the reading on the DIN scale really is the value that they release on.
Jon’s Ski Tuning has one of only four Huber ski binding torque testing machines in the UK & it only costs £10 to have your bindings checked.