Must say I envy your luck. While I am no expert here, I too bought a Samsung in 2013 it works fantastic even today, meanwhile two low to mid ranger Sony's in my household one bought in 2012 one in 2017 have died in 3-4 years with panel failure. Similar experience on even big ticket buys recently with a friend of mine who somehow again went with a 77" X90J when their 3-4 yr old Sony died, Sony throws in a 10-20% MRP discount when they don't have the parts. Why do we still aspire for Sony's - A 1999 CRT is still in working condition at my parents and they were fans till the recent failures. All I imply is QC levels and quality of components have definitely dropped with the LED/LCD deluge and outsourced/ procured components and brands like SONY seem to be working as mere assembly lines these days. All that being said extended warranty seems the best fail safe to enjoy the brand's pq without living in constant fear.
Must add I have yet to see or experience the 3rd party insurance or warranty covers personally despite having bought them for my recent electronics purchases like robot vaccums, smartwatches etc. but yes they are a little bit suss unless you clearly ask all the TnC as they do charge a bomb. Best is brand's own extended warranty.