Beats the whole essence of culture then. Saying that it is dynamic means that today's lifestyle becomes our culture.
The way that people lived in the past over hundreds/thousands of years carries a wealth of knowledge that is based on understanding one's body, self, environment and society's role in it.
The above inform the lifestyle that an individual and a community will lead. A good example is the diet that one consumes nutritionally and mentally.
Don't you think that our current health issues(physical and mental) are intrinsically linked to our lifestyle which is inalienable from our current culture?
The culture of our past is a book that we're better off reading than leaving closed. I'm not encouraging going back to circumcise women,
I'm saying let's preserve and study it well. Let's pick and choose what works for us, because that living book of knowledge will disappear before someone has written it down.