> Java, for its part, can also accumulate a lot of dynamic language-style performance losses to pointer chasing and run-time type lookups (and GC churn) if you're not careful about how you use generics.

The worst thing about Java is the average quality of Java programmer.The same could probably be said about Python. However I think that there are fewer Python programmers trying to write AbstractFactoryFactory than in Java. Java has a terrible culture of overly verbose, deep inheritance trees that make debugging and development worse, with worse performance.