I mean, having to rename "Emily" to "Mom" (separately from renaming the relationship) is awkward and counterintuitive in itself, inconsistent with how it works with all the other characters, wipes out any trace of the character's actual name, and looks weird in the dialog titles (especially when she's talking to someone other than the MC and Bailey) and other menus. And if players miss this secret way of making it work (naturally expecting that the name you give her is supposed to be, you know, her name, and might be used by other characters), the dialog becomes unnatural.
I know you're fine with it, but the patch is better.