Speed of hair growth is in about the same range across ethnic groups. Eaxh strand of curly hair varies more in thickness than straight hair. This is because the actual hair strand gets thinner at the point of the twist of curl. This is a vulnerable point in the hair shift and it breaks more easily than parts of our hair that aren't twisting into a curl.
So of you have straight hair your hair is less likely to break off with simple brushing etc.
Lucky curly haired people need to moisturise their hair to defend the twisty parts from snapping- its more likely to happen when the hair is started. I also expect oil on the shaft helps to protect these vulnerable parts of hair from friction of all sorts including brushes and combs.
So, to experiment, you can plant your hair and leave it, no brushing etc, keep it oiled and hydrated. It will grow grow grow, same rate on average as straight hair.
Whenever you are blessed with something precious, you must take extra good care of it.
Is every woman out of their teens trying to emulate white women when they wear straight hair styles. I do doubt it it. But also, when we do and we look in the mirror and think we look hot, are we completely free of the racist conditioning that tells us everything white is best? Probably not. That's not the same as wanting to look like a white woman, though.
Its worth nothing that every expression of phenotype is possible amongst African people. Every colour of skin, every type of hair. BECAUSE EVERYTHING STARTED WITH AFRICA. EVERY LAST THING.
Why we gave a history such that white people, who had spent thousands of years away from the Motherland felt they had to do what they did when they returned and try to convince everyone including (most importantly themselvesis another topic, but slightly related in my head is that actually white people try to look very much like black people.