I emphasised the “slowly” because c# has the reputation of being “a bad copy of Java”, while apparently the opposite is true given how long it took Java to copy closures and to produce a bad copy of LINQ.
They want to prevent another half-baked implementation of a feature like they did with generics.
C# is much faster and has much more features, but because of that it's also a bit of a mess sometimes. For example regarding closures/anonymous functions it has delegates, lambdas and anonymous (inner) classes which all have overlap but aren't fully the same.
Java only has anonymous inner classes, and a convenient syntax and good support for anonymous inner classes with only 1 method (which they call lamdbas)
