A big reason this technology wasn't viable before was that computers weren't fast enough. In order to get the fuel detonating at the exact right time, the computer has to control each cylinder closed loop and make microsecond decisions based on speed, load, changing throttle input, etc. We're finally seeing embedded systems that can run such tasks.

Same goes for common rail diesels that monitor the cylinder pressure of each cylinder and precisely control fuel timing for the most efficient burn. I had a job towing/hauling with ford 6.7 diesels, amazingly smooth engines. They'll start up in the dead of winter with 3 seconds of glow without being plugged in, it's insane.

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1984 300TD -- summer daily driver
Many others that aren't Mercedes...