In canvas's defense, canvas and SVG/VML are different tools for different jobs. You make good points, however I don't think this entry was particularly negativ

In canvas's defense, canvas and SVG/VML are different tools for different jobs. You make good points, however I don't think this entry was particularly negative towards canvas, or merit it needing a defense. However I have to comment on the "different tools for different jobs" bit, as that is a response that comes up in every NoSQL/SQL discussion as well. If you drew a Venn diagram of the optimal uses of SVG and Canvas, just as with NoSQL/SQL, you're going to have a lot of overlap where it's a judgment call. They are different tools that have arguable merits for a lot of the same jobs, which is why it's important to know about both of them.