And it's still "not a solved problem". A fair part of "solving" gc is optimising for context-specific tradeoffs as application domains and environments change.

And it's still "not a solved problem". A fair part of "solving" gc is optimising for context-specific tradeoffs as application domains and environments change. That will continue forever unless we all agree to stick with one architecture to build all of our programs. That's the reason different gcs fare better now than in the 90's, for example, when nobody cared about concurrency.