There are number of ways to address this. See the FAQ (this is a clickable link)
Easiest is to put a smart switch cover over the existing switch. That way the bulb will always have power so it can hear the next “on” command but there is still a Switch on the wall to use. But there are other options as well, so read the FAQ.
Yes, smart switches will work better than smart bulbs for most people.
The primary reasons for getting smart bulbs are because you’re renting and are not allowed to change out the switches, because you really want the color changing ability, or because you want to create zone lighting in an area where there is only one wall switch.
If none of those apply to you, a smart switch will work better for most situations.
These bulbs aren’t self powered or battery powered. They need power to turn on or off. So if the switch is powered off…
If you need a light that doesn’t screw into a socket that requires power, maybe look at getting a Hue Go that plugs into the wall. Just make sure that you don’t plug it into an outlet that can be switched off or you will run into the same problem. Just another thought.