Encryption shifted the focus of surveillance on the devices. They lost control over our data.
Knowledge is power, and in an unencrypted world all the FBI people can still just call by the phone, because only the state gets the info from the telcos.
Now that everything is encrypted, they panic, and want to get a hold of the devices.
This CCSAM argument is such an obvious pretense, it's crazy. This is literally not something that needs device backdoors. Just better police work.