I can still use light switches to turn off my lights. I can also turn them all on or off at once, change the brightness, color, and temperature. Smart light are great, I'm sorry they confuse you.
It has nothing to do with me not being able to set it up. It more has to do with the stupidity of the user interface of pulling my phone out of my fucking pocket, navigating to the app, navigating to the menu and picking the lights and the color and flipping it.
Most people don't have such a complex setup that this ever comes into play. However if you have a stage in your house (not a movie theater, a full stage) you would want that level of control. There are probably a few dozen such houses in the US.