This directive is much more to do with ensuring Engineering know when the device is required and can ensure it is presented in a servicable state, ready for use.
You wouldn't expect to just turn up and take an aircraft on an ad hoc flight would you??
It is also important to log its useage so that operating/maintaining the device can be justified and the data may also be used in any future business case for an extra or updated device.
I think it has very little to do with trying to stop people maintaining flying standards.