There is no such thing as a "human-centric perspective". There are many human perspecives and to say that James Cameron's Avatar is a representation of one, united "human-centric" perspective ignores the essense of anti-colonial analysis.
The human brain is very good at finding differences.
There's no human perspective because we're experts at figuring out how we're different from one another, and we have no clue what's universal and what's not.
It should become self-evident to us once we encounter ET for real.