Rationality requires intelligence, and the kind of intelligence that we use (for communication, progress, FAI, etc.) runs on language.
It seems that the place we should start is optimizing language for intelligence and rationality. One of SIAI's proposals includes using Lojban to interface between humans and an FAI. And of course, I should hope the programming language used to build a FAI would be "rational". But it would seem to me that the human-generated priors, correct epistemic rationality, decision theory, metaethics, etc. all depend on using a language that sufficiently rigorously maps to our territory.
Are "naturally evolved" languages such as English sufficient, with EY-style taboos and neologisms? Or are they sick to the core?
Please forgive and point me towards previous discussion or sequences about this topic.
I started to, but didn't get very far. I might pick it up again at some point - it's definitely interesting how different it is from what I'm used to, and it seems to actually be a bit closer to how I naturally think in some, but not all, ways. (In fact, it's close enough that I should probably rethink my claim that I don't think in language - I certainly don't think in English, but how I think isn't all that much farther from English than Lojban is.)