>>82224915
>why is communication so hard between people
That's a question with a lot of moving parts. It also depends on whether you mean at large, or interpersonally.
Assuming the latter the summary would be that all people are fundamentally different. Our neurological pathways that shape our brain mean that people's thought processes are physically distinct and as such understanding another human being when you are working with different hardware is an uphill battle. Language is an axiom agreed upon to try and get two (or often more) distinct systems to converge on the same process. Even when you and another person come to the same conclusion or have the same thought, the minutia of emotional connotations, attached memories and experiences, and habitual cognition will create a separate understanding of the idea between the two of you. The more different you and another person are, the wider this gap becomes.
It's why talking to girls is so fucking confusing.