I would be careful with that approach.  These companies look for opportunities to deny a warranty claim wherever they can and so you really can’t give them an opening;  that means following all their service intervals, going to the dealer for maintenance and work, and all that ends up costing more in the end compared to doing the maintenance yourself or going to an independent shop.  I prefer to take to my own mechanic or work on it myself, and not be subject to following all the rules and guidelines set by the manufacturer/dealer/warranty company.

Also, I would hate to break down along the side of the road especially at an inopportune moment;  yeah, the vehicle may be covered under warranty (if you follow their guidelines to the tee) but it’s going to be super inconvenient at that moment (say you are in the desert in 110 degree heat or in the mountains late at night.)

My own recommendation:  get the right vehicle in the first place that will not break down and doesn’t need an extended warranty.

Saw your comment about aftermarket fluids, this isn’t a bad thing as long as they are the correct ones. Many aftermarket companies make fluids just as good as what dealers sell. Same goes for some parts. Good mechanics know when aftermarket parts are ok or not.  Far as your friends position on having cars under warranty. Personally I like the way some Audi and BMW’s look. I still won’t buy one. Who wants their ride in the shop most of the time? Even if covered under warranty. 

I have bought cars for less than what an extended warranty costs. The companies are good at finding ways to not pay claims and usually the warranty isn't worth the paper that it is printed on.

I usually pass on extended warranty plans as you wind up spending more on the warranty than repairs would cost and they also dodge paying for anything.

I had a 1994 Plymouth I bought new. I got an extended warranty on it. I got 1 transmission, 2 C.V. BOOTS, 1 new air conditioner compressor and some lines that rusted for $600. I have been leasing but I did buy a 2021 Toyota Highlander Platinum. 10 years/125,000  0 deductible, no charge towing to the nearest Toyota dealer for $1,800, Toyota backed. It’s like life insurance. You don’t need it....till you need it. And for the brand reliability aspect I had an ‘84 Camry that left me stranded 3 times with less than 50,000 on the car. 1 transmission, 1 oil pump and a timing belt at 30,000! My 2021 has a lot of features on it. I indeed to keep it so I enjoy the piece of mind. To each his own.

The devil is in the details. Generally, these don't work out, in an absolute cost/benefit sense. There's no way to assess whether this is a cost/effective strategy sui generis, sans data. Quien sabe? (Who knows?) 

I would never do this. Anytime I have bought extended warranties and tried to use them the company found some way to not honor it.

Usually, these extended warranty plans are gravy for the dealership because unless you have your attorney explain all the details to you in the plan, the dealership can always find a way NOT to honor it.