Protecting users from malicious apps seems to be the main thing. I think you can manage files even without rooting. I plugged a phone (XZ1C, Android 9) into US

Protecting users from malicious apps seems to be the main thing. I think you can manage files even without rooting. I plugged a phone (XZ1C, Android 9) into USB now, the computer offered to open the phone's storage, 2-3 clicks later and I see the photos that are stored on the phone.