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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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.”
I think important research can be done here. Identifying lightweight methodologies that have higher correlations with usability (whatever that really means...) and seeing if they can meaningfully influence system design in practice.
