You don't need a "box", get a Roku stick for cheap, plug it into a port, and load Pluto or any of the bajillions of stuff available, a lot for free. Roku channel alone offers hundreds of live TV channels, and a huge amount of free movies.You are not wrong. One thing we discovered last round: all smart TVs are not alike.
We had a medium size Insignia FireTV for years. Good picture, and we loaded Pluto TV to get some good free content. The remote finally died, so we went to a larger RCA model. Good picture, but we have been unable to load Pluto. It's like it doesn't exist to this brand. It's probably because it came with "LG Channels", which is similar, but not equivalent. I researched how to add Pluto and the best answer was "add an external Roku box". Nah.
If I were looking again I would probably lean Samsung or LG.
Good luck!
Or you can get a Firestick off Amazon. Advantage is you can side load Firefox browser, add uBlock Origin to Firefox, buy a Bluetooth mouse off ebay for < $8, and you can go to YouTube website and watch videos ad free. Use the mouse cursor to navigate just like on a computer, drag the progress bar thru in video ads.
I prefer the Roku interface, so have that for living room TV. But have a Roku TV in bedroom with a Firestick to watch YouTube vids while getting ready to hit the sack.