Because browser support is inconsistent, SVGs are often larger than equivalent than even lightly optimized PNGs, and it's a lot easier to find or create raster

Because browser support is inconsistent, SVGs are often larger than equivalent than even lightly optimized PNGs, and it's a lot easier to find or create raster images than to obtain high-quality vector art. Also, you actually often want different images at different scales, so that automatically scaling one image is not that big an advantage. I want to use SVG, particularly in Javascript apps. It seems like a more elegant solution/workflow for things like icons. It would certainly beat abusing fonts to put small images on a page. but it has sort of missed its opportunity.