Overall a good article. I learned that speed should depend on the screen size, something I had never thought about. What I don't understand is that we are not

Overall a good article. I learned that speed should depend on the screen size, something I had never thought about. What I don't understand is that we are not supposed to use motion blur. Is it only because it's hard to do right? Also I always thought that the "when the moving objects transform their size disproportionally, they should move along the arc rather than in a straight line" thing felt wrong. Anybody else feels this way?