Smart lighting only makes sense in niche cases. I use the same Z-wave switches in my 60s-era house for a basement guest bedroom where the light switch is bizarrely in a storage closet outside the bedroom. I have another Z-wave switch to turn on an existing front porch light at dusk. This spared me needing to install a separate photocell.

The main value for smart home is in monitoring. I mostly use it for flood and door sensors without having to pay for a Ring/ADT subscription.