Then there are thousands of more important things to teach.
A licence is a legal Permit and it is pretty essential that the holder knows what they are permitted to do!
It's rather a specific and non-usual situation in my opinion.
No, its a very common question as you can probably judge fom some of the responses. It is as well that you ask especially as so many pilots don't appear to know the answer. One cannot help but wonder if thats partly due to the number of changes there have been to the licensing system over the years. The next tranche is almost upon us, and is finally based on the chaos theory.