I think books like this are profoundly important. There is such a huge stigma when it comes to Suicide and it really does make it hard for those who have thoughts of suicide to seek help. This book is beautiful written. 
 I enjoy the duel narrative and was almost holding my breath sometimes as I waited to find out what the next reason was and how it all connected. 
 It made me feel all the feels but it was also very true to what I knew. Years ago, I attempted Suicide. Luckily I was pulled from the edge and I survived. I did reach out for help before my attempt and I was let down. It wasn't taken seriously. 
 Some would say that Hannah is selfish and unrealistic but there are plenty of Suicide survivors that have read this book that would disagree with you. One thing to keep in mind is that at least in my experience when a person gets's that depressed, and ready for it to be over, Small things can seem even worse than they really are. 
 Things that no one would actually kill themselves over, little things, start to add up to create or merge with bigger things, everything crushing you and confirms to your mind that it's not worth it and you'd be better off or a multitude of other horrible misguided conclusions. Which is why this book is so important I think. That one thing you think is no big deal, the joke you told behind somebodies back or something super small, something that alone, nobody would kill themselves over, may just be the straw that breaks the camels back. The one thing that makes the burden too hard to carry anymore. So it's incredibly important that we be mindful of how our actions affect others.