Because it makes no sense. I can't even figure out where you are going with it. Do you think individualism is when you allow people to do some stuff slightly different from other people? But then it makes even less sense for cultural practices because cultural practices are collective, it's the opposite of what seems to be your idea of individualism. Either way it really doesn't matter because it is an entirely incorrect way to approach the issue and a large misunderstanding of what individualism means in marxism.
Why?
Because it makes no sense. I can't even figure out where you are going with it. Do you think individualism is when you allow people to do some stuff slightly different from other people? But then it makes even less sense for cultural practices because cultural practices are collective, it's the opposite of what seems to be your idea of individualism. Either way it really doesn't matter because it is an entirely incorrect way to approach the issue and a large misunderstanding of what individualism means in marxism.