I quite like the Sony Bravia UI. I did intend to just use a connected Raspberry Pi 4B running LibreElec to play my own content, but I ended up using the Kodi app from the Google Play store, which was superior at the time (h264 and h265 hardware decoding, plus working HDR. The Pi4 firmware was lagging behind). I have used my Pihole for DNS to stop calls to tracking services like Samba. A fairly recent firmware update meant I could attach a cheap gigabit Ethernet adapter to the USB3.0 port, so happy camper here.