Zigbee is great -really- but it has an appeal problem as it's not the 'open platform' it pretends to be. It's woefully hard for a non-techie to set up a real smart home with various brand devices.
Even for me it's been a rocky ride until I realized I needed always-connected, same brand devices (bulbs) to stabilize my battery-powered-remote-heavy mesh. I can't imagine how a layperson manouver around different manufacturers stuff.
