Years of study is required to understand the verses of Holy Quran...
Years of study is required to understand the verses of Holy Quran, the traditions, the narrators of traditions and the system of knowing whether a particular tradition is correct or not; the interpretation of the sayings of the Prophets. All this requires specialization. Sometimes it also happens that to find the solution to a problem related to marriage, divorce or rearing of children one has to see many verses of Quran and refer to tens of traditions.
Then one has to closely study the accounts of tens of narrators of traditions in the books of Ilme Rijal. Can everyone really have this much expertise? Does it not mean that everybody should leave their work and get busy in studying religious law? While we do not even know if all the people have the ability to reach to the level of Ijtihad or not.