It seems C++ approach is quite good: you have a very stable (if a bit too stale) standard library, and you have Boost, which is a cutting-edge batteries-included extension to stdlib curated by much the same people as in the standardization committee. It serves as a great _inclusive_ counterpart to the _exclusive_ stdlib and a sandbox for stdlib extension proposals.
It seems C++ approach is quite good: you have a very stable (if a bit too stale) standard library, and you have Boost, which is a cutting-edge batteries-included extension to stdlib curated by much the same people as in the standardization committee. It serves as a great _inclusive_ counterpart to the _exclusive_ stdlib and a sandbox for stdlib extension proposals.