To be fair, GC was always a big TODO item that became less and less important to implement until there were no go reasons to implement it in the language core (

To be fair, GC was always a big TODO item that became less and less important to implement until there were no go reasons to implement it in the language core (as you can implement it on top of the language), and removed from that list. The other two are really part of the same coin. Having green threads involves having a runtime that has to be started. Deciding to remove the runtime means removing the green threads.