cognitive psychology. PhD 
I train Rust since 4 years (Meetup, Hack & Learn and actually as a paid trainer for 3 years now) and I _hate_ it when people bring up "learnability" in language RFCs. Most of the time, it's a bit of anecdata, scrapped together.
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We tried something slightly structural in this direction and it was useful I think. https://arxiv.org/abs/1901.01001
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The core challenge is understanding learnability in a rigorous but efficient way. Most people don’t have time for user studies, teaching courses, following students, etc so we rely on our experiences and intuitions. Surveys at best.
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A symptom of this in academia is the propensity to use lines of code as a usability metric. “Examples in our system are avg 50% less LOC than leading competitor. Therefore we are more usable.”
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Glancing over if before I step on the plane, 2 things caught my eye: 1) you quote numbers from the survey. The problem is that there's no comparison numbers with other languages (which are hard to get by, but I would have mentioned that).
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We literally don't know if our language is good or bad there. Being part of a teaching foundation, 25-50% drop-out rates are not _unusual_. (Note, anecdata!)
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