Since lockdown started, we've gradually converted most of our house to Hue. A key feature is that _all the light switches still work_. We just don't use them all that much, unless something's failed.
From reading Matthew Garrett's exploits, I'm pretty sure we don't want WiFi IoT devices. We have Hue switches next to the physical switches, which don't depend on WiFi being up; Smart control works with only local networking. Add more smartness for extra control (SmartThings, remote access, Google Assistant), but it's no less functional than a non-smart system when the smarts are offline.
The killer feature for me is the ability to adjust the colour temperature and brightness of lights in each room -- I've got a 50W panel above my desk which makes my work-space brighter than it is outside at the moment (Edinburgh, UK, 1pm with rain) but automatically fades down to a warm, dim light as the evening progresses.