The 6.4 Powerstroke has much different failures than the 6.0L. In my opinion the 6.0 failures are, for the most part, completely "fixable" which is not the case in the 6.4.
We have seen bottom end failure on the 6.4 which include both bent and broken connecting rods which, many times, end up resulting in a hole in the block. The worst and most common failure is spun bearings which render both the block and crankshaft "unrepairable" in most cases. Many times these failures happen in low mileage engines.
If someone gets 180-190,000 miles out of their 6.4, the failures in those higher mileage engines is usually having to do with a cracked piston. Those blocks can almost always be bored and rebuilt.