I never really know how to feel about personal correspondence being used to craft writing that is supposed to reach a broader audience. Don't get me wrong - I *love* reading the letters and diaries of people whose names I see all over bookstores, but the way this letter by Chimamanda Ngozi Adichie was used to follow up on her wildly successful speech "We Should All Be Feminists" made me feel a bit weird. We don't know any of the people she refers to in the letter (not that it necessarily matters, but we lose some depth), and the advice, while helpful for a broad range of people, is given to a specific person whom she has a close relationship to. I don't really think that this letter stands out as something particularly special, perhaps because we are missing those nuances of personal connection.
There are certain aspects that I felt were missing (then again, when talking about feminism, there's always aspects missing, in my opinion, as few currently popular authors have a clear queer intersectional feminist standpoint), which makes sense, given that her friend surely would not have read 100 suggestions encompassing the entirety of feminist pedagogy.
As I wrote in my review for "We Should All Be Feminists", I find this letter to be a solid start into figuring out what feminism is and how (easily) it can be incorporated into daily life, as well as the impact it will have. Nonetheless, readers should definitely branch out to further pieces of writing which prod the topic more deeply afterwards.