Yeah, I suppose I've used the word beyond its scope. Let's take dancing for example. People go to social events, like clubs, to socialize, dance, and hookup with people. That's definitely beyond the word hobby. However, let's say you want to learn to dance and decide to go to a dance school and take classes. I would consider that a hobby. Now, in context to the OP, activities conjoined with skill implies, at least to me, that maybe they're talking about the latter kind of behavior. I dunno, but your view is perfectly valid.