For balance on the Multistrada's 50,000km teardown, here is a link
to a similar piece Motorrad has done on the Yamaha Super Tenere.
This is the model which UK mag Bike wrote up after a teardown at 80,000km (50,000 miles), the writers expressing astonishment at the low wear exhibited. However, a big proportion of that mileage was long-distance touring in the hands of travel writer Nick Sanders, and so you'd expect wear to be low as most in any engine occurs at start-up from cold.
Nevertheless, I'd thought the Yam might come out of the Motorrad teardown better than the Ducati. Having taken a look, I'm not convinced that is so. Three exhaust valves leaking, a piston pin seized to the piston, a litre of oil used per 4000km and lots of carbon around the combustion chamber.
This was a press bike that had gone through several different magazines over 10,000km before settling in at Motorrad, however.