I'm not very familiar with video/audio codecs. I have a 2.1 soundbar hooked up to my TV and I stream Netflix, Prime, Disney+ straight from the on-board Samsung Tizen app store.
On occasion, I'll open up the web browser and go to town on some meh-quality streams (usually 1080p anyway).
I guess I'm asking, what's the point of an Android TV box? With a proper setup, is it better quality than I would get with built-in Tizen apps?
If your tv works for you, that's fine. Keep using it. However, when it gets old and slows down or doesn't get app updates anymore you can just plug in a new Android box for $20 to $150 bucks instead of buying a new tv for way more. Its that simple.