My internet connection at home is down, today, so I'd not expect to be able to stream Netflix through my Roku device.
My Tablo, though, is on my local network, so I'd expect it to work.
It doesn't. When I try to run the Tablo app on my Roku, I get "not connected to the internet" errors.
I've talked to people who've used their Roku to access local Plex servers without an issue, so it looks like this is something the Tablo app is doing.
I'd not call this a high-priority use case, but should it be possible to stream from the Tablo without having an internet connection?
I'd think so.