I just use a small little PC (no NAS) to stream content from the internet. For local, over the air broadcasts, I use a Hauppague external USB dual tuner that has been rock solid for years.
The PC controls everything using a gyro/air mouse. The only thing the big dumb TV provides is a HDMI display. No mess, no ads, no injected content, no spying. I have full control of what I choose to see --- sports, movies, etc.. You would be hard pressed to name something I can't get.
I use a mini PC with an air mouse to add my own "smarts" that I can control.