Using "it" to refer to human beings feels super disrespectful to me. Dehumanizing much? 1992 called they want their attitudes about trans people back. Obviously if someone told me they prefer "it" pronouns I'd use them but I would feel gross about it.
Edit to add that I have nothing against the Finnish people, and obviously there's a huge cultural difference between being totally fine and just a part of the language versus the cruel and dehumanizing way that "it" is used in the United States. It's clearly not the same and to assert otherwise, frankly, feels intellectually dishonest. I didn't expect to have to make that distinction.