The purpose of TMC* is to handle traffic related functions. This includes giving info about delay and update distance/arrival time accordingly. If you don't want it, why turn it on? (so there is a need to turn it off later?) You give new destination and before driving decide to have TMC or not. TMC is complex (has lots of hooks into many subsystems) and it's not wise to mess with it so you get half-and-half functionality. I might add ability to disable via long pressing the TMC button in cockpit but that's about it. I don't like to cluttered the cockpit with unnecessary buttons.
* Since there is no way to have traffic other than online traffic on android, TMC is referenced as online-traffic
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