Creating new canon will ultimately prove most people wrong to varying degrees. So lengthy debates over stuff ultimately simply mean that everyone already has their headcanon to a degree, which of course they’d want to become the real canon.
At which point I’m again not sure what we gain by canonizing anything. No canon basically means that everyone is right with their headcanon. That’s a win for everyone.
The appeal of getting your creation and your name associated with a franchise you love is strong, I don’t deny it, but is it worth all this debating? Is it worth proving people’s headcanons wrong?