This is correct. There's a bunch of stuff that would require significant investment and also closed source components. It's telling when even Emby doesn't have a client in the PS4 store.
Is this a Samsung Tizen TV?
No one has come forward to help with one yet... We do have things in the works for most other platforms, and the browser is always a possibility.
Most "boxes" that you get would let you use your TV remote through CEC. If you really wanted to add something on, then I would probably recommend anything from a Fire Stick 4K to an nVidia Shield.
Remote access and a single library of truth across multiple clients - keeping track of what’s been watched and when. There’s other bits, but that’s the most important.