When I bought my 2013 LC in 2018 i initially opted for a 3rd party warranty. Due to the known issues of cam tower leaks, timing cover leaks and the radiator issues on the pre 2018 model years. After my radiator showed the common crack i contacted the warranty company and they wouldnt honor the repair as the radiator hadn't failed and spilled its coolant everywhere. I canceled the warranty and got most of my money back.
Also with cam tower and timing cover leaks, they are often small and remain as seeps for a long time and so i imagine most aftermarket warranties will figure out ways to avoid covering the job.
Headgasket insurance would be my main reason to consider a warranty....with that said throw the money that the warranty costs ($2,000-3,500) into the market and within a few years youll have a good chunk of change to cover any repairs. Just some food for thought.