With every automation, you always have to think: what will be the impact if it doesn’t work? Home automation is composed of many different systems by many different vendors that speak many different protocols: things will go wrong. It’s up to you to make sure that they have a limited impact when they fail. Ideally, devices should fall back to a pre-smart home experience. A Philips Hue bulb will act like a standard white light if turned on/off using a normal switch or when not connected to a hub. If things get worse when your system is out of order, your users will revolt. Take for example the Nest thermostat that had a bug in the beginning of January which caused it to stop heating the house, yikes!