Why are senior doctors being thrown on the scrapheap?

Each year in Australia some 1,850 doctors retire their medical registration.
Many do so not because they want to cease practice, or because they have lost the desire to care for their patients, or contribute to their communities – they do so unwillingly because of AHPRA.
Its stringent, all-or-nothing rules around CPD and recency of practice prevents these doctors moving towards retirement by taking a partial step back from medicine.
To me they constitute a medical workforce of vast experience that is being squandered.