If this is not the case why? It seems very logical that if you needed this system for coverage in your house you would need extended range for your Smartthings Hub z-wave and zigbee devices in addition to WiFi.
Since zwave is a mesh network, any of your mains-powered devices will act as repeaters. That’s the whole idea. So the light switches, in the wall relays, plug-in sensors, outlets, plug-in pocket sockets, any of those.
See the following for tips on how to lay out your devices for best Z wave performance. First read post 11, then go back up to the top of that thread and read the rest of it.
So I don’t know exactly how the Samsung connect home operates in this regard, but you should be able to set up a strong zwave mesh without needing them.