There's this thing in linguistics, casual language requires backchanneling - to respond back with either short utterances that show you understand, or to show confusion and then ask for clarity

The reason formal language is formalised, as in the shit used in essays, is that there is no easy way to say "what did you mean?" - the feedback loop is far too slow for that process and by the point the author(s) get to respond they likely forget what they meant as well