Michelangelo's Finger is not a satisfying book. Good science writing can be clear and precise without being inaccessible. However, Tallis's philosophical claims are largely under-theorised and often conflate important differences. Additionally, his knowledge of the empirical studies relevant to his subject is very weak. Many of the empirical claims that he makes are straighforwardly wrong. Those with a serious interest in the role of pointing in the evolution of human culture communication would do better to read Mike Tomasello's more academic but still accessible 'Origins of Human Communication'.
For all its flaws, I enjoyed grappling with Tallis's book. He is passionate about his subject matter and writes with a contagious sense of intellectual curiosity. This, along with its wealth of interesting ideas, makes for a book that is fun. But it is certainly a missed opportunity.