If cell phones had e2e encryptoions so the normal court-order landline eavesdropping disappeared from law enforcements' toolboxes - there is zero chance they would ever have been allowed in the hands of the public.
But they haven't. They can physically install a listening device at the location in the warrant and thereby record any conversations you make from there. That gives them the same capability they historically had with landlines.
For every phone, you can just slip an antenna under the case (or in the phone's body) and pick up the LCD switching interference – faint though it may be – and figure out what's on the screen from there. Or, you know, CCTV.
Encryption-for-the-masses merely protects from mass surveillance; anyone protecting themselves from targeted surveillance isn't going to suffer from an encryption ban.
Also, so long as metadata is available from cell towers, you can still use the most useful piece of data: that someone's phone was at a crime scene, even if the communication itself was encrypted. That will always be the case (unfortunately also in authoritarian regimes).
Counterpoint: yes it is.
They can't do that to the entire public at once because it's not economical, but that's the point.