Huh? With one hand move the mug directly alongside coffee jar; with the other hand use spoon to transfer coffee to mug. Spillage will be minimal, and I can see no way that liquid from the mug could transfer to the coffee jar. (If this method is insufficiently flawless, then I'd be interested to know how you spoon things from pans or serving dishes onto plates / into bowls, etc.?)

Bad design irritates me, and bad design for no apparent reason irritates me more, but what irritates me most is that people seem willing to accept bad design and brokenness in everything around them -- from "Oh, it always spills when you open it" to "Oh, they do crash occasionally". Now I realise that it's realistic and sensible to have some expectation of imperfections in the world around us, but personally I don't like accepting mediocrity or outright crapness as the best of all available alternatives. (In the end, though, it's a personal decision as to whether the potential improvement is worth the effort of finding a better alternative.)