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> The corollary is that you don't improve what you don't measure.

I mean, this is a nice saying, but it is pretty clearly not true. Lots of things that aren't measured are improved; we have not measured my two year olds vocabulary at all, but it is certainly improving.

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Indeed. The correct corralary is "Things that don't improve aren't being measured"

E.g. negating A => B yields !B => !A

So measuring learning is a good thing, because it means you will likely be more deliberate in actually getting better at it, as opposed to just leaving it up to chance

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