Articulating the ineffable. Programming language theory 
cognitive psychology. PhD @Stanford
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Two sides to this: science and design. For a sec, ignore that this is a CHI paper with design implications. Regardless of whether tracing is useful, studying tracing can still give insight into how the mind deals with mechanistic procedures, e.g. the linear vs. on-demand split.
Even if tooling improves where a human never traces again, it's still useful to study humans in this context. For example, I love the paper "Studies on the telegraphic language" (1899) b/c they used students of Morse code to demonstrate the existence of a learned skill hierarchy.
As a design question, my hypotheses on why tracing matters: 1. Execution underlies comprehension. I'm not saying manual tracing is a good thing like "it builds character", but that research on other skills like language suggest tracing matters.https://twitter.com/wcrichton/status/1353157373259620352 …
2. Automated tracing implies access to concrete data. But that that can be hard to actually write down vs mentally simulate.https://twitter.com/wcrichton/status/1351684584329650181 …
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