Mine works completely if there is no internet. I like the Hue system as it only relies on the internet connection for software updates of you want them. The Zigbee network it uses has been super reliable for me, and always responds to the app which only needs to work on my LAN. It only gets spotty sometimes for me when used via Amazon Echo devices, which have to phone home to interpret the voice command before triggering the Hue devices.
Your approach sounds similar to mine. While it is true the switches work without internet, out even without the local controller - I just learned the hard way that they don't work at all when the capacitor inside dies. Keep a dumb switch on hand so you can swap it in when you have a light you can no longer turn on!
I had 2 die recently. The is a thread out there on repairing them, but I don't think my soldering skills are that good. I'm also thinking "repair my light switch?" What has the world come to?
