I strongly encourage you to get extended warranty. I also have another positive story about extended warranty coverage.
I drive a 2012 Infiniti QX56, the same body style like the Armada you have. Mine is the top of the line and has all the gadgets and electronics.
My credit union offered me extended warranty at a whooping cost of about $3,700. I said no thank you. They said they give me a week to make up my mind. I said my mind is made up. I do not need warranty.
4 days down the road my dvd headrest on the driver seat stops playing. I called my credit union the next day and paid for the extended warranty. I waited a month down the road then I took my QX to the dealership for the DVD problem. Cost was $2,500. My warranty paid no questions asked.
My warranty expired earlier this year. I had it for about 3 years. By the time my warranty was expired, the extended warranty company had paid over $20,000 in repairs on my suv. Yes, I am not even kidding you. I documented it here on my maintenance blog.
My extended warranty paid so much money that one of the last times the dealership called for a repair approval, they flagged my suv for possible fraudulent claims. I took it for repairs to this one dealership only. They asked them to hold the car while an investigator comes and conducts an inspection of possible fraudulent activities or claims. My car stayed there 3 days before an inspector got there and did his investigation and took pictures. Then he left. The next day the extended warranty called and approved the repairs.
My warranty is over now and my car has not given me a headache so far. They have fixed so many things on this car that I hope not to get rid of it any time soon. 168,900 miles and still going.
I had a second car amd daily driver, a 2008 Nissan Maxima, which I bought brand new but it died on me a few months back after 12 years and 3 months of use and putting over 265,500 miles on it.
Well, I just replaced that Maxima about 3 weeks ago after 3 weeks of my Maxima's "death" with a brand new 2020 Honda Accord Hybrid as my daily driver because I hate the consumption on my QX. My Hybrid is giving me above 50mpg around town and on the highway on long trips, 43mpg doing 80mph.