In January this year I bought a Sony TV. A KD-60XF8305, to be precise. Some time after the purchase I installed the update to Android 8.0. This update had the Android security patch level "1 November 2018". And it remained on that patch level since then.
Since November last year, there were official Android security updates every single month and a lot of them had pretty severe issues fixed. This is something that I consider to be pretty much unacceptable on a device that is connected to the Internet at all times. (And while it is not an issue for me: A lot of people have this thing in the same Wifi where all the guests of the house connect to with their malware-filled mobile phones...) A lot of said issues are well known as of know and are known to be exploited.
Also this is a 2018 model year and not an old device. I am pretty much speechless at this point...
never buy a tv for its smart features....i have a sony tv as well and happy to see any update it gets...i also have a shield because tahts is kept up to date and does a better job at everything.