Chickens and eggs. If you have vector data already, it's better to distribute the raw vectors than to rasterize them. If you only have raster data, distribute the rasters (where viable) instead of trying to trace them. Lossy operations are lossy.

Vectors are largely preferable to rasters, but that doesn't mean you can reproduce them if you only have the rasters. Just like distributing source code is usually preferable to compiled binaries, but that doesn't mean that we just pump everything through Ghidra and call it a day.