Looks like smarthings can now run local processing vs cloud, so HA can control zigbee or zwave locally thru ST.
So does this mean that I can control a Samsung Smartthings device without the Samsung hub?
Since ST and Hue both use Zigbee, could I add an ST device to the Hue hub? Or all of these to a Z-wave stick?
No, this is because Hue has limited third party support.
It’s ST hub doing more local processing vs cloud I guess, I have not tried.
Its still limited to devices based on capabilities, reliance on SmartApps, etc. You can go to this page to see which devices are truly being processed locally: