We have a firestick, as it was cheaper than trying to sort new aerial cables or a satellite dish when we moved back in post tenants. The only thing I can't get is Food Network, and some of the Channel 5 stuff.
No, it doesn't listen afaik. There is Alexa, but I'm not sure if that's on the Firestick or the sound bar.
My TV has never connected to the internet. The Firestick does all that bit.
We have Amazon Prime, so we get access to all the stuff on there that's free with Prime, so movies, box sets, (and NCIS), we have the ITV app, BBC iPlayer, the Channel 5 app, the Channel 4 app. Dh has discovered you can get YouTube on there, so moves seamlessly from the computer to the TV to watch car things.
I think it's worth it, and has avoided having to run new cables from the attic to the room where we have the TV, and drilling through floors and ceilings in the process.