This is what I've done; I use a Z-Wave power meter on my electricity meter for whole-home, then some individual ones for my desk/3dp/rack, the ~50 ZigBee device

This is what I've done; I use a Z-Wave power meter on my electricity meter for whole-home, then some individual ones for my desk/3dp/rack, the ~50 ZigBee devices I have are mostly bulbs or sensors (I also have another ~40-50 Z-Wave devices) and the majority are things that use very little power; the usage stats from those things is a rounding error. For bulbs and sensors, the power usage isn't useful for automation either, you can use other data they provide (turn off lights when no one is around, do stuff when doors open/close). For whole-home though, it can be useful to see if the power is higher than you'd expect; if it's not dinner time and we're using 2kW+ for more than a few minutes, send a notification in case someone left an electric heater or an iron or something on.