When seen as a field of study, a natural language including English is voluminous and subtle. However, basically, understanding a natural language would maybe not require intellectual genius or some sort of special ability as in mathematics for example.

The system of a natural language is not so straightforward and tidy. I think mastering a natural lanuguage is no easier than mastering a field of technology at the occupation level.

Here I don't mean one of those two is superior to the other. People have each talent and disposition, and every kind of field of job needs people to come.