Trying again. Apple TV allows cable authentication for Apple TV apps. There are apps for a lot of the Comcast channels - HBO, Showtime, Food Network, etc. So if you have, say, a Food Network show that you really like then you can watch it in the Apple TV. CBS content is now available in the Apple TV via the Paramount app. Etc.
Since the Apple TV interface is far superior to Comcasts', if the shows you like can be played via Apple TV apps then you will likely be better off watching there than via Comcast. [FYI: I am a Comcast subscriber as well]
Look at the free to use Pluto TV app! It has many channels that cost money on cable!