Joshy, I think you're misunderstanding the dev's post. He is in no way attacking you, and he isn't saying Emma is not a valid LI. If he felt that way, then she wouldn't be an option. Emma is a darling, and she will mature into the LI role if you want her.
The "natural relationship" with Char is because of their shared history, shared enemy, shared trauma, etc., not the dev saying she's the canonical choice. It may be his favorite choice, but he's writing them all. Enjoy what you enjoy, if it ain't hurting anyone.