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I read somewhere that the last quarter of this year is a target for their introduction. I may have seen it on @vandeberg's latest post, but do not specifically recall.

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No idea.. but it's something that has to be done to prove that SMTs work. There'll be loads of experiments, and I suspect plenty will be broken just like what we have at the moment. The economic reform proposal attempts to be a close approximation of an economic model that works for a content discovery and rewards platform. Other use cases (that's currently messing with the current system) can be SMT use-cases riding on what i hope to be a successful core platform, if the SMTs ever come.