IMO one of the problems with saying stuff should be added to std because it's more trusted is that one of the main reasons it can be that trusted is that it is small. Tokio, just the main repo not including dependencies developed by the same project but in other repos, is approximately the same size as std (65kSLoC for tokio vs 79kSLoC for std). If larger projects such as this get merged into std that would necessitate increasing the maintenance team (which is already not able to keep up) diluting the trust inherent in having a small set of known developers.
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