Na, both are important in Art. I find it totally valid to equal skill with Art and also understand if you disagree on that, but saying that equaling them means you don't "understand" Art is pretty harsh. After all, making you think or feel something is a skill in itself. A super detailed and close to reality picture of a frog makes me think quite a lot about the amount of time and work involved, lets me marvel at the Details and, well, skill of the artist.