a) Local dialects, similar to sign-languages. e.g. "good fruit" might mean "mango" in one Toki Pona community or "apple" in another
b) It felt kind of freeing, because a lot of words convey a very broad concept. It is actually really interesting to talk about certain emotions, because "a bad day" is "a bad day" and one doesn't really need to go into specifics into _what exact kind of bad_ in order to be consoled by the other person. This is not super helpful if you need a problem solved or need to describe what kind of pain you feel to a doctor, but just for the every-day venting it was kinda nice.