I was basically throwing stuff at the wall and seeing what sticks and makes a pretty picture for me. Vector embeddings were just one of the things I threw, in hopes of boosting news items thematically similar to the stuff I already liked. I can't really tell how much good or bad are they doing. All I know is that they are fast (embeddinggemma through ollama) and their output is worth few points in some combined heuristics that AI concocted for me.