As has been discussed, there are many different options. 
People commonly use smart bulbs either because they want the color changing capability or because they have one switch controlling a room and they want to set up separate zones within that room.
It’s easy to add a wall switch that will work with these smart bulbs, it just has to be one that does not cut current to the bulbs. That way the bulbs can always hear the next “on“ command and you avoid damaging the bulbs with inrush current.
There are several different ways to do this. See the following FAQ (this is a clickable link)
The inovielli switch Is just another variation on this, but there are other devices available now that will also work.