I rarely watch directly on our main TV (Vizio PQ65-Fi) -- using the AVR for the 7.2 Surround Sound. In fact the only time it is switched to that mode is to scan the channels... just in case. (We, also, have a couple D32f-FI models -- Kitchen and RV)
Anyway, the only time I use the "SmartCast" is to use "Alexa" to turn the sets on/off and adjust volume. I was surprised to find this mode is quite impressive.
https://www.vizio.com/watch-free
For those that simply want to "cut the cord" and are not interested in a subscription service, this is perfect.
I gave it a quick run-through and found, for instance, the Major Network News shows -- Live!. The EPG is quite good. The Guide lists all of the 150 channels showing what is currently playing (high-lighted show playing in background) as well as what's next on each channel.