Privacy advocates got access to Locate X, a phone tracking tool which multiple U.S. agencies have bought access to, and showed me and other journalists exactly what it was capable of. Tracking a phone from one state to another to an abortion clinic. Multiple places of worship. A school. Following a likely juror to a residence. And all of this tracking is possible without a warrant, and instead just a few clicks of a mouse.
See also: automobiles. Automobiles and smartphones certainly have strong cases for how utilitarian they are. They are both genuinely very useful.
But the expectation that everyone has one, along with them becoming practically a requirement for most people, has turned them into a dependency and a means of control. Some people can manage to forgo them, but you almost have to build your life around doing so.