ِDude, philosophy is like an endless ocean, you enter it you get fascinated and there is no way back. Once you see, years have passed and you have not managed a single firmed baseline for your own thoughts. You read X's beliefs and you have no choice but to accept it, and the next year you read Y's books, the absolute opposite of the X, and once again you have no way to reject it, and you have no other way to accept what he says cause you believe he is right either. Just like a small boat submitted to the waves of an ocean.
Not just me, but many believe that philosophy, should be considered an outdated science, it relies too much on spiritual aspects of human and masses behavior, hence I recommend you this one book you are currently reading be your last philosophical reading and rather you start reading psychology.
Psychology roots from both philosophy and physiology, where unlike philosophy it is not too reliant on spirituality and suprenality, and neither like physiology, it depends too much on physiological behavior of the mind.
Diversity of believes in Psychology, might be a little confusing like philosophy, but as it is a newborn science (around 100 years old) you can master the science very quickly.
As I consider myself a pro on the subject
Well, you remarked fascinating points, yet I am so so about your post.
For me, Philosophy is trying to find out the stuff that you have not find them out with experimental sciences.
In old times, philosophy was polluted with theology garbage, but now, it has reframed itself. Some like Stephen Hawking, think that philosophy will die as the physics expands. I believe they are wrong, since the philosophy includes broader perspective such as the philosophy of moralities, ...
About Psychology, it has always fascinated me. There has been many different theories about masses, and controlling them proposed by Edward Bernays, Anna Freud, George Gallop, ... yet, it does not replace philosophy, but is a more practical approach.
kollan ham kasi aadam hesaabet nemikone 
