To be fair the power train battery is already covered by a long warranty period from Tesla. And I doubt any other vehicle warranty covers the 12 volt battery, kind of like tires, but I could be wrong. But at this point I'm probably not going to get an extended warranty, only because my funds are a bit short this time of year and especially this year. I doubt my car will have computer or display issues, I mean because most home computers are pretty solid now a days, so the ones in my car should be too.
If the computer failed, and you needed to pay to replace it, it would still be less cost than the extended warranty you are contemplating buying.