The issue is that with smart bulbs you really want them powered up all the time - which is obviously counter to how a physical wall switch works. Otherwise when the switch is powered down, you lose all control of the smart bulb - as it has no power going to it.
So a workaround is to replace the physical wall switch with a button/button controller, and leave the bulb powered up, and thus controllable, all the time. The button just sends a command to HE or whatever hub to control the light.
What I recommend, is if you can give up the color changing ability, just get a zwave wall switch and a regular bulb. Very simple, almost impossible to mess up, and easy for ANYONE to use (well, anyone that can use a light switch... lol).
If you really want color changing, then you will have to do something different with the wall switch/wiring or live with the bulb being unreachable/uncontrollable/throwing an error if the wall switch is off and there is no power to the bulb.
Or a less elegant option, if you can live without use of the wall switch, is turn on the switch and put a lock on it (they sell them at Lowes, etc), or put tape over it. Then you would only control it from Hubitat, lifx app, etc.