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.)

I hold the pan over the plate, which works much better. (I do that with coffee jars too, when they're not much too large to lift, like this one.)

The willingness to accept bad design is presumably a third factor in why manufacturers don't generally find it worth their while to fix things or to pre-emptively avoid flaws in the first place; if their customers can't be bothered to vote with their wallets and will continue forking out money for a broken product, why bother?

Surely being much too large to lift is a flaw in a coffeejar? Doesn't it hold so much coffee that some goes stale? (I hold the jar tilted over the mug for this operation.)