Lightroom is a great editor. It is a slow culler.
We are working photographers, and we edit in Lightroom too. But culling a wedding inside it meant waiting through an import before we could even scroll.
The catalog wants to own your photos, previews render while you are trying to move, and a few thousand frames in, it drags. Culling is the one part of the day that should feel instant, and it did not. So we built a tool that does only that part, and does it fast. It is called PhotoTaken. You still edit wherever you like: your picks follow the photos in through standard XMP, with no catalog import of the rejects.