I'm sorry but I think you need to do some research before making broad generalizations about the nature of body hair removal throughout history. Not all cultures around the world enforced a completely hair free body like it is in the west today. Women did remove certain parts of their body hair but not all, as you seem to believe.

Body hair is natural. Having more estrogen doesn't make you naturally HAIRLESS. A lack of estrogen can however cause EXCESS and coarse body hair. It's important to note the difference between those two statements. Body hair is a more telling sign of sexual maturity as it is a natural part of puberty. Children are hairless, and also cannot reproduce until they hit puberty, and a telltale sign of puberty is the growth of body hair.