It is impressive, but I'm not sure why doing stuff without training is such a good thing. Giving a choice, I'd rather have a model that works better with extensive domain-driven training than one that works worse without it. After all, when choosing an expert, you usually go for one that has the best experience in the field, not the one that can speak most eloquently on the widest variety of subjects (unless we're talking about politicians, there everybody does the opposite for some reason).