I don't mind it that much, I never use my personal name anyway so whether it's the default name or some OC name I made up won't really affect my gameplay.
But I have to say, from a game development perspective, not giving the user the option to change the MC's name feels like a limit on the programming side. It's a very basic function that can potentially enhance the player's experience - obviously not the people who don't mind, but you know, there are people who do mind and they're losing out on that audience. Having the option is nice. Unless there's a very specific reason why the MC MUST HAVE a specific name in the story, I don't see why users shouldn't be allowed to change it.
If necessary, the developer can make a compromise, such as locking the family name but allowing users to change the first name.