It's the manufacturer's attempt to make the diesels more car-like in feel, and increase the appeal of the diesel utes to a larger market.
Ever ridden a big single cylinder bike? We used to laugh at the Nortons with a power-stroke-every-second-telegraph-pole. Diesel engined motorcycles are even more problematic as single cylinder engines for the same reason - there's a huge hit of power then nothing until the next power stroke (even a slow-down as the valves close and the piston rises on the compression stroke).
The older single-pot bikes were notoriously difficult to start, and used to thump the rider, because the compression happened immediately before the big push making that part of the combustion cycle particularly 'physical'. It's also why lawn mowers vibrate so much.
And it's also why my GL1500 is so bloody smooth - 6 pots, just hop on and enjoy!
Anyway, the DMF takes out some of that variation in rotation velocity of the crankshaft. Is it a good thing? It's not bad, because one of the things that makes long-distance journeys so tiresome is constant vibration. Reduce it and the journey becomes more pleasant. It does reduce the 'feel' of the engine somewhat, but you can still tell when the engine's lugging, so you can still tell when you're not being too kind to it.