Ridiculous. Can you provide a valid reason why you don't support FireStick and only support ROKU? So many people have Amazon Prime and FireSticks and you are screwing yourself by this. I've had so many bad experiences with Spectrum; I have been a customer for 15+ years and find that I will probably have to leave Spectrum and go to a different provider which I really HATE to do.
Sideloading appears to work (somewhat) for FIresticks but does not work for Fire TV (boxes.) Fire TV boxes are told to unplug the HDMI cable before the app will work.
So I am super confused on why the Spectrum TV app is not available on the fire stick but it is available on the fire tablet. That does not make any sense to me. Also, every time I try to subscribe to TV channel apps like Disney, VH1, Bravo, E, BET, AMC, A&E, just to name a few, Spectrum is never on the list of TV providers. It is aggravating that every time I want to watch something on demand in another room or if I am not home, I cannot watch it with my fire stick because TWC/Spectrum is not on the list. Spectrum is like the only TV provider that is not on the list. I always see AT&T Uverse, Dish, and Direct TV on it. Honestly, this makes me want to go with another provider so I can get all the benefits that I pay for monthly.
While I agree with your point, fact is at current time the Spectrum TV app is only available on a Roku device (in the streaming device class of products such as Fire Stick/TV, Apple TV, etc.). On video game consoles it is available on Xbox One and not Playstations or Wii. It is available on select Samsung smart tvs but not Sony, Visio, etc. Personally I would love for the app to be available on the Apple TV.
Search the forums for this topic and you'll see instructions on how the app can be sideloaded on a Fire Stick if you have the technical knowledge and patience to use it that way.