A simple reason privacy matters. My iPhone has warned me my music has been too loud this week. What it doesn’t know is that I have connected it to a Bluetooth / headphone jack speaker a number of times and so the volume has been adjusted on the speaker itself with my iPhone set to max to ensure max output from phone to speaker. Maybe that’s old school thinking to maximise source output sure but then pass this data to my medical records and I could potentially be refused hearing aids in the future, see my insurances rise or be refused treatment for ear conditions. This is why data is useless without the owner being in control. Apple your approach to CSAM appals me. And yeah I’m a long term fan boy.