Museums have a good number of people (infrequent and regular visitors), who have a need for fairly general information. Within that group, you have a small portion that is especially unlikely to know your norms. This small group, infrequent visitors, is incredibly important. In design, they often say design for the extremes. In other words, pay special care to the people who have special needs, and everyone will feel special. So, when you work hard to make sure your labels meet these infrequent visitors, your regular visitors will win.
Read more about Labels in the World of Information Overload.