SmartTV is still a missing link for me too. A Kodi RaspberryPi hooked up via HDMI seems viable.
I wish I could just flash the firmware with a Linux and reinstall the Apps I need, but the whole ecosystem seems way too intransparent, and I'm not a passionate hardware hacker.
I started liking https://izzys.casa after someone linked her meandering horror story on the C++ ecosystem on awful. All her posts seem to be written like that.