Doctors specialize too, but there isn't a doctor in practice that isn't an expert in human anatomy. Are you saying law students graduate from law school and apply for the bar without studying and knowing the Constitution? What exactly do they study in law school? Isn't the Constitution the very foundation of law in this country? Is it possible to practice law in America without a firm knowledge of the source of that law?
Do you remember stuff from your first year in college ? Do you remember every course you ever took ? How are you at high school trig ?
It's like someone who hasn't openned a math textbook since high school being asked about string theory.
Yes, just as it is possible to practice most other fields on a day to day basis without a current command of the original foundations. Besides, constitutional scholarship is not really a foundation of legal practice, most of which is derived from English Common Law Practice ammended by statute passed by state legislatures. Most practice avoids constitutional issues altogether.
A law degree is a tool. Having a law degree does not mean one has memorized every law ever made.
When the Court found that privacy meant that abortion was going to be legal, that became the precedent.
Meaning, settled.
Of course, we have the 9th. circus, some supremes looking towards Europe and Zimbabwe for their precedence but that is a whole other story.