re: Xbox One S and home theatre setup questions

Re-igniting this thread for a few more questions.

1) Does the Xbox One actually record shows through the digital antenna? It appears that it only stores up to 30 mins on 1 channel for pause/rewind, correct?
1a) Even if it just buffers for 30 mins, how much internal storage does that eat up? Should I buy the 1TB version for the buffering or does the 500gb version work just fine for buffering?

2) kballa6 mentioned that the Xbox One S does not bitstream audio. Can someone explain further?

3) I have a Harmony Remote + Hub. I currently have an activity for "Start FireTV" where it starts my receiver + TV + Fire TV. How does something like that work if my FireTV is connected to the Xbox One S?

I'm thinking about working backwards on my upgrading and start with an Xbox One S, then a 4k receiver + 4k TV. My dilemma is that I just don't game a lot but looking for the Xbox One S to be more of a Media Center type device.