If Apple really integrated Dark Sky, why is its Weather app so bad?

Apple claims that Dark Sky’s features have been integrated into Apple Weather which the company says offers hyperlocal forecasts for your current location, including next-hour precipitation, hourly forecasts for the next 10 days, high-resolution radar, and notifications. So, why is Apple’s Weather app still so reliably wrong?
Apple’s Weather app
Apple claims that the Weather app “provides the most important weather information in a smart layout that adjusts to the current