Can the LIFX switch control outlets for just an on/off function?
AFAIK you can use a switch to perform any function that a regular light switch does. For example one of my switches is hooked up to a sensor which then activates the light.
It wouldn’t, however, be able to control a fan+light that has a knob to control speed. Its just simple on/off. Check the wattage limitations as each switch and the whole switch can only handle a limited load.