I kinda agree with this, especially when it comes to people who are not just still alive but also actively involved in the writing of the book and dictating wha

I kinda agree with this, especially when it comes to people who are not just still alive but also actively involved in the writing of the book and dictating what can and cannot go in it (like it was with Elon Musk and Walter Isaacson). At that point you aren't reading a biography but a PR puff piece. On the other hand well-researched biographies of historical figures who have been out of the public limelight are among the most interesting books you can read, which I'm sure will be the case for Musk as well maybe 30-50 years from now.