I think you are right. Though I think that one can have all the benefits of the “community-developed stdlib” with the namespaces approach as well — e.g. Java’s

I think you are right. Though I think that one can have all the benefits of the “community-developed stdlib” with the namespaces approach as well — e.g. Java’s new Date/Time API actually comes from a third-party package called jodatime, it was just so good that it found itself implemented in the standard library of java, and then later on plenty other languages as well.