are the richest person on earth. Is it reasonable to assume you’ve randomly run into the richest person on earth? Why would you assume there is anything special about this person?
They can be special to you on a personal level (they’re the only person you know) but they are most likely average. Analogously, earth is the first planet we know.
It is the only planet we know that has life. That is the evidence we have that it is special. We also know there are many other planets out there. just like
it is ridiculous to assume the first person you meet is the richest (ie special) why should our default assumption be the earth is not average (ie earth is special)?