> I almost feel like she writes to share things with people she loves, even though she doesn't know them directly.

Thank you for articulating this!

I'm not Julia, but I'd just like to put down here that this is pretty much my philosophy for public speaking/giving presentations, and I have been trying to instill it in some coworkers who struggle with presentations. It's a great privilege to be able to convey to one's peers and loved ones things that you're (likely) a bit more familiar with than they are and which may help them with some matter.