CX had a A330 land at HKG not so long away with a dead engine and the other stuck developing substantial power. From memory it crossed the fence at 200 kts.
I guess that was down to luck? Suppose the live engine had been developing more thrust than could have been dragged-off with the gear, flaps,.... ? You'd have to keep above Vef to keep control and, depending on loading, you could take the gear off with an engine developing high thrust. It doesn't bear thinking about -- and doesn't happen (we hope) but we can only prevent these things from happening when we recognise the potential problems and feed them back to the engineers (manufacturers) to get a solution.
You simply cannot have a design in which it is impossible to shut down all power. It is conceptually wrong. It must be possible to shut down all power units, preferably from the cockpit, by some means that does not rely on a data bus.