This annoys me too. My Casablanca fans have a wall switch which is hard wired to power only for on/off, but the fan and light controls are sent via a radio frequency signal. The most frustrating part of this, is that the RF transmitter inside the wall switch is battery operated. I have to unscrew the wall switch a couple times a year to get to the batteries.

As someone that designs battery powered RF devices. It's shocking an disheartening seeing stuff like that.

Things drawing an average of a few hundred microamps while the fan is running. Probably because it's blasting a keep alive packet once a second or so. It does that because a transceiver costs an extra 50 cents.