There's no reason the body and interior should be destroyed by 250K miles. My last truck sold with 150K on it and the interior looked brand new. Another 100K surely wouldn't have devolved it into total ruins. I will give you the fact that the body was rusting out in the rocker panels pretty bad- but that was because I ran it as a DD in all the winter salt for nearly two decades. It was garaged in between trips in the salt/ice too, which is even worse.
My Raptor lives in a garage, but it does not get that winter abuse, so I expect the body to essentially last forever. The interior will last just as long- I simply don't destroy my stuff.
I get that some of you have the money to pay cash for a new Raptor as a toy or for your DD, or you always have a car payment and that's not a big deal to you. Good for you, you've done well in life and who gives **** all about the reliability of an engine you won't own beyond it's warranty period, right? All these Gen 1 guys harping about how ****** the engine is- I mean, it goes, right?
No matter how much or how little I make, personally, I don't want to keep buying full sized 4WD trucks every 5-10 years for the rest of my life. I take good care of the body and interior, so it actually matters to me how reliable the drivetrain is at high mileage. The 6.2L will be reliable, the 3.5 TT will not.
Don't get me wrong- I don't hate the 3.5L TT, I own and DD a Taurus SHO. I don't plan to keep that car forever though- since it's a DD the salt will eat it.
As far as big power goes, you can rationalize it all you want, but it's as true now as it ever was. Repeat after me- there is no replacement for displacement. If you want to make 1000+ it's so much easier to do with a 6.2L engine vs a 3.5L engine. If it's still not clear as to why- just keep making the first engine size bigger and the second size smaller until it makes sense. Envision a 8.0L Viper versus a 1.0L 3 Cyl Fiesta engine. How about a 8.7L big block Ford vs a 130 CC weed eater engine. If you want big power, use a big engine.