My reason for wanting to use the Starz app is two-fold. One is so my wife can start watching Outlander faster since that's all she's interested in watching. The second is that the Roku voice search searches among all installed apps excluding Xfinity Stream. So when I do a voice search for a Starz show the results show up for the Starz app which I cannot use. I too have contacted both companies, Starz blames Comcast and Comcast tells me to use their app.
Hello, jawrsh. Thank you for your feedback. If you have any other questions, please feel free to reach out to me.