There's Plex, but also things like Kodi that just turn a PC into a media center. We're in the midst of a move right now - when we settle, a Mini PC is going to replace the streaming box.
If you've got some hangup about plugging a video source in your TV -- the way we've always done prior to TV vendors deciding they wanted to not just make the screen but control what's on it -- and would prefer to use a hobbled TV OS running on an underpowered SoC instead of just using a cheap and far superior Rasperry Pi, then, yes, you can indeed still just install Kodi directly onto the TV.
Title "Get Started"
First card "Root your TV"
Description "Jailbreak your TV and install Homebrew Channel. Gain more control over your TV"
So, to install Homebrew Channel, as your comment instructs, I'd first need to root my TV. No way are any non devs capable of that.
Re-read the link you've shared.
> First card "Root your TV"
Now look at the second card -- the one that says "no root required".