Pistons burn thru like that when the cylinder is running very lean. With only 750 miles on the GW that is the perfect example of the "infant mortality" that I was talking about in another thread.
When something is manufactured the odds are if something is going to fail, or was not put together right, it will fail very early on. Most likely within the first hours of operation, then the first tens of hours then the first hundreds of hours, becoming less and less likely on an exponential curve. For a machine like a motorcycle, if you make it to the first regular service interval (4000 miles for example) then the odds of something failing after that are extremely low.
If it hasnt shaken loose or exposed some kind of material or fabrication error by then, its probably all good for the next 100,000 miles.
So something making a piston run very lean and burning thru in 750 miles is not unusual. A complex machine like a motorcycles has several thousand parts / pieces. It only take one screw or nut, or resistor or transistor in the ECM, one loose connection... to render the entire motorcycle un-usable.
Honda will be all over that engine. When one engine out of a thousand fails, that broken motor is worth its weight in gold to the engineers - because it is the only thing that can tell them what has gone wrong and needs further attention, testing, screening... to keep failures out of delivered motorcycles.
A good company learns from every failure that hits the streets. A crappy company keeps cranking out crap and never resolves the problems with the design and fabrication.
There is another aspect here: engineers must resist their human nature, when something fails on a customers bike like that, to fix it as quickly as possible and give him his bike back. Its more important to get their hands on that bike and figure out the cause of the failure, than it is to slap another piston in the bike and a new fuel injector and get it back to him the next day.