When SVG is the right output
SVG is a vector format — infinitely scalable, tiny for geometric content (logos, icons, simple diagrams), directly editable in a text editor. You cannot meaningfully convert a raster photo to SVG (the "conversion" is just wrapping the raster inside an SVG shell). SVG makes sense as an output only when the source is already vector-based (logos, illustrations exported from Illustrator / Figma).