AppleTV functionality really only makes sense for a standalone television since you can stream video on macOS already either via the web or via an app.
And I think the plans for a standalone television passed when Jobs did (and AppleTV hardware again became a "hobby" rather than a serious product line). I expect he was the force behind what would become the TV App and Cook and Company did not have the Force of Personality that Jobs did to bend all the cable and streaming companies to his will and make the TV App - which was supposed to be a one-stop-shop for all your streaming and cable content - what he planned it to be. I also expect the idea for what is now AppleTV+ started with him.