I think there's more to this than just the vector story. Since we're entering a high-DPI world now, the pressure for anti-aliasing and high quality scaling has dropped significantly, a substantial phase shift from the old rules of screen typography where AA was the key feature and all formats needed to optimize for it. As a result vector glyphs are ultimately competing against not just SDF but also crudely downsampled 1-bit textures, and this latter approach, while it's very "brute force", has a relative simplicity of design, and potential for high compression rates.
high-DPI has never impressed me beyond some point. I use a 55 inch 4K TV as my monitor today. I find the huge desktop space far more valuable than having little tiny pixels. So even though it's 4K, the text is rendered at a similar DPI as a 24" 1080 monitor. Besides, what's good at low DPI should only be better at high DPI right?
