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Because there are millions of developers who can use the DOM and CSS to create their design and only a handful who can do the same with Canvas.

This argument is correct, but you can take it further:

It's not so much about being able to do it with canvas. It's the fact that you have to reinvent all of your tools on top of canvas.

When you're tying your square wheels together into a big circle so they turn better, it's time to start reinventing.