As with any car its is always a gamble that a fault may materialise. However are Porsche cars so unreliable or more unreliable than any other car out there, I know that parts and service can be more expensive but so it could be said for other makes, is paying for a warranty a necessity really?
I have been running an Audi A4 as a daily car since new in 2007 and it runs today as good it did when new with nothing in the terms of major faults or repairs required, its coming up to 90,000 miles and is still on its original exhaust system (I know this is not a warranty item).
Your car is still a very relatively new car from 2014, barely 5 years old which is nothing in car age terms these days.
Insurances and warranties certainly bring peace of mind at a cost, and may be worthwhile if you are worried that it may develop an expensive fault, may be worth comparing warranties other than Porsche ones to see how they compare price-wise and what they cover?