A booker for the readers 

Glad to have finally read this classic. It certainly stands up to the reputation. 

The majority of advice here seemed to be common sense, easy to say but hard to put into practice; only couple of the tips felt like actual actionable items, and many of even the actionable items didn't have clear help on putting them into solid habits. 

A strongly emotional read, with examples selected that exemplified the horrors of war behind the myth perfectly. I perhaps was a little bit not ready to read this book -- I have little experience with books about war, and this is my first one with such strong accounts; my previous experiences have been based in the spectacle of war you see in combat footage online. Some literature references were a bit beyond my reach but it didn't impede the book, as references were supporting to points and emotions already firmly enmeshed by real examples. 
Some parts of the book were repetitive, but not to the point where reading wasn't worth it. For all the author is a little prose-y and pretentious, the read itself would be quick if I hadn't needed to pause every chapter to get a grasp on my own feelings. 

Overall an effective and horrifying look at war, both in its societal impacts through mythos and its individual terrors. 

An informative, fairly fast read that to me primarily explored the relationality of Indigenous research. Other reviewers are right that exact methodological rigor for other scientists is perhaps not clear -- I got more focused feeling and emotion out of the book. As a bioinformatics researcher I enjoyed this aspect, as many of the specifics aren't highly relevant (I don't work directly with people!) but the concepts (linkage, circular thinking, context, research as ceremony) are, and they're what shone through strongly here. I think choices in style (such as use of conversation, more traditional writing, notes to the sons) were all helpful in exploring and encouraging me to integrate the book's concepts into my own context. 

Though the book felt like it had some repetitive portions and I felt like some that were unnecessary (especially in anecdotes of the authors personal life), the core message is great and overall shined throughout the whole book. It was a really enjoyable read, though I think primarily useful for people also struggling with the emotional reality of near term human extinction.

Just didn't enjoy this book or find the advice particularly meaningful. Felt disgustingly surface level and barely actually explored Ikigai from what I read. Authors approach to it as an aspect of Japanese culture just felt strange.