Your point is very valid but only on the realm of web games using browser's native support of svg. For instance, you would not have DOM-related problems if you

Your point is very valid but only on the realm of web games using browser's native support of svg. For instance, you would not have DOM-related problems if you use svg files in a native mobile game. The downside of using SVG in a game is that the render is slower in comparison with a rasterized image. However, all graphics formats have pros and consts, so it always depends on how are you going to use them.