I think it depends on the device. In your list the only one I have is a "Smart TV" & I don't bring that directly into my automation software (and I'm a PS4 guy but we won't go there. :) ). I have 3 cloud based devices & they are Nest Thermostat, Bond ceiling fan/light controller & Google Home. They don't work when my internet is down but my 15+ z-wave devices (mostly wall mount light switches & receptacle plug ins) still do. Granted, if no internet, Google Home can't control anything. But in a web browser, I can still access & control all the z-wave devices. I also integrated my PC to be able to turn it on or off (even with google home) but it uses some windows network specific protocol.