We honestly just need to stop trying to make criteria for what being nonbinary is point blank. I really don't give a shit if people think this would obscure the term into uselessness because right now the concept of a nonbinary person is a skinny person who transitions into elfish androgyny, typically thought to also be white and afab by default. Which excludes, like, the vast majority of people who are nonbinary to serve some imagined ideal of a third gender
"But what if this opens up the door for cis people who are chasers/want a claim to transness without experiencing oppression/etc to INVADE the nonbinary community" Cannot emphasize enough that this is already how most people see any nonbinary person who doesn't fit into the aforementioned skinny and completely androgynous elf thing lol