>Is it superfluous for operation of the vehicle? How to disable?
95% of vehicles on the road have Event Data Recorders (EDRs). Occasionally there is a physical box that could be disconnected, but usually that box ties into airbag systems. Mostly, telematics are baked straight into the vehicle's computer and impossible to remove.
For years, engine tuners have used piggyback computers to adjust sensor data real-time. They trick the OEM ECU to create more horsepower. Someone could create a plug-and-play telematics piggyback, but it might disable safety systems. I haven't ever seen one, though.
Best option is to drive classic vehicles.