two things I noticed: 1) the great majority of features were authored or contributed by Taylor Otwell - in any cases he was the only name next to each feature.

two things I noticed: 1) the great majority of features were authored or contributed by Taylor Otwell - in any cases he was the only name next to each feature. How this is sustainable in the long term? 2) it is still using a lot of singletone/static methods and so on, how they can promote some solid testing culture?