This is a great article, and it reveals some interesting new ideas to test out. However, I wish they included examples that qualitatively demonstrate how effect

This is a great article, and it reveals some interesting new ideas to test out. However, I wish they included examples that qualitatively demonstrate how effective each improvement was. Some of us don’t have a team of almost 100 high-end data scientists like they do. Since I only have a couple of people, I need to always be careful to focus on techniques with ROI (low implementation cost, (relatively) high effectiveness). Machine learning can be labor intensive.