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Sure, but are the standard activities actually optimal even for this purpose? For example I learned to program as a kid, then in college wrote one of the first open source cryptography libraries, after which I had my pick of job offers. I probably put less total hours into this than someone who practiced piano for an hour a day from age 5, and got more out of it. But I'm not sure if that was luck, or if I can expect my own kid to duplicate this.
Also, now that learning to program has become a standard activity that parents push kids into (just look at how many tablet games there are that purport to teach kids how to program), it probably doesn't have as much signaling or practical value due to competition, and I'm wondering what is the modern equivalent of learning to program as a kid in the 80s.
Superforcasting might be an area that will be very useful in the future.