This book is very important for every Muslim because it presents a big picture of the development of Fiqh and causes of disparity among schools of thought. Most of the sincere learners get ensnared by Salafi propaganda which is based on the questions like- "Why are there different (even completely opposite) rulings on a certain matter of Deen?", "Why should a Muslim follow a Mujtahid instead of extracting rulings from Qur'an and Hadith?" etc.
Please share this book with others, especially with sincere new learners.