What other significant costs am I missing?
Language has redundancy at least partially for purposes of error-detection-and-correction.
Adding new short words increases the probability of undetected (or detected-but-ambiguous) errors.
We were discussing this in the Eliezerfic Discord server a few weeks ago, and aurellem made a Google doc which listed their brainstorm for what phrases/concepts might be good to have short terms for. The doc also has a list references to Baseline (the constructed language used in dath ilan) in Mad Investor Chaos.
I'm sure this happens in many areas (maths, for one), but medical language is a pretty well-optimised system I know well. You might like to use it for inspiration:
Medicine: "72yo F BIBA with 3/7 hx SOB, CP. Chest clear, HS I+II+0. IMP: IECOPD"
English: 72 year old woman brought in by ambulance because she's been short of breath and had chest pain for the past 3 days. No noises were audible over her lungs with a stethoscope, both of her heart sounds were clearly audible with no added sounds. I think it's most likely this is being caused by an infection on top of a history of chronic obstructive pulmonary disease.
I read some linguistics books a while back, and more recently I've been reading (against my better judgement) Mad Investor Chaos and the Woman of Asmodeus. So, I've been thinking about word length and concept importance a lot.
Question 1: Should we be picking one or two syllable words for phrases/concepts central to thinking better? Is the hit to interpretability (which LessWrong is not really optimised for as is) worth it? What other significant costs am I missing?
Question 2: Which phrases/concepts?