Let's say you buy new rig and you have a bumper to bumper 3 year 36k miles warranty and a 5 year and 60k miles powertrain warranty. A no deductible warranty at that. Extended warranties have deductibles, unless I don't know about some that don't have deductible on some coverages. There is no need for an extended warranty over that whole time.
During that time you start a savings plan for maintenance and in the future repairs. If you spend money as fast as you make it and don't save, well that is on you. If you buy a new rig and have nothing left over, after monthly payments and insurance, that is on you again and IMO, you should not be buying a new rig. You are free to make that choice.
If you can put back $500 a month for the 3 years, that is $18k to do maintenance with and still have a nest egg for repairs after the first 3 year 36k bumper to bumper warranty and then two more years to continue to save an additional $12k to have for repairs toward the powertrain repairs, if needed after that.
If you just have to have an extended warranty, by all means buy it then.
But, IMO, what happens is that the customize bug hits and you wipe out the savings because you just gotta have it, NOW!
I know that in 5 years and after taking care of the rig I bought the way it should be taken care of, I can make $30k stretch for maintenance and repairs and even if you lower your monthly saving from $500 a month to $250 a month, a smart savvy person can make it happen.
$500 a month is $17 a day to save and half that for the $250 a month after the 5 years.
Instead, you buy an extended warranty for, I am gonna guess because I don't like the things and don't follow their costs, $3000 to $4000 and if you cannot buy it outright, you pay more making payments. Then the deductibles along with all of that and having to wait on call backs and adjusters.
Buy a new vehicle, take care of it the right way on the severe duty schedule and have enough patience to save the $17 a day or more. Hell, over 5 years if you save $20 a day that is $36,500.
Even at the end of 5 years, and $20 a day savings, you have almost half of what you paid for the rig if you paid $80k, which I will never ever do.