Dr. Conway? She's not here anymore. She wasn't liscensed nationally so wasn't allowed to practice here any longer.
I really liked Dr. Conway...
But she was liscensed in California! I thought that was all that mattered! Can we still even have an appointment today!?
Without the Tenth Amendment the national government could take control of whatever it wanted. Everyday things we depend on from the state, like speed limit laws, business liscensing, including that of doctors, the timing of public schools and the local government in general, could suddenly become controlled by the federal government, wreaking havoc on everyday life.