Nowadays, new applications emerge almost daily, and users quickly decide which ones they'll stick with in the long run. If a program malfunctions or runs too slowly, users will easily look for other solutions. On the other hand, a stable, reliable, and responsive application can offer a serious competitive edge on the market. Users value high performance, user-friendly design, and innovative features that make a product truly stand out among similar solutions.
In this process, test coverage provides an accurate picture of how thoroughly and extensively the code has been tested, and how this coverage evolves during iterative, agile development. If this metric is low, there's a high chance that the software contains bugs that can lead to serious consequences later on.