I'd say the RF link used for keyboards/mice has more inherent flaws/problems than Bluetooth.

RF keyboards and mice have horrendous non existant security even with the models which claim to have encryption and security features. Anybody nearby can see exactly what you're typing. If they put a little more effort into it, they can inject keystrokes and move the cursor.

There are very limited numbers of channels available for most keyboard/mouse RF links. If you have more than a handful of people using it in an office then you'll interfere with each other.

Most keyboard/mouse RF links don't have any form of error checking or recovery. You'll lose keystrokes or have erratic cursor movement because packets are being dropped.

802.11b/g/n doesn't have any coexistance mechanisms to reduce interference with the keyboard/mouse RF links. It does have some for Bluetooth.