I don't mind it at all. It makes the story feel more natural, especially when characters can say her name in voiced scenes I get tired of the silence whenever the characters call the MC's name
I wouldn't mind at all since I like to leave the MC name as default so the other characters will call her name. It's more of a problem for me when the MC doesn't have one and I have to give her one haha. I think it's rare that we can't change the MC's name in otome games, I don't think I've encountered this before, so I would be really curious as to why and if it has something to with the plot.
Honestly, it doesn't bother me at all.
In fact, if a name isn't specified, I end up agonizing endlessly over whether to use my own name or come up with an original one, so it's not an issue at all if the default name can't be changed.