If a person is otherwise healthy, no. Or at least, there is no medical indication to do so. But a person with pre diabetes is not generally otherwise healthy. T2DM is not a condition of a healthy person, it is a lifestyle disease caused by lack of exercise, poor diet and obesity. This person should see a doctor, but they’re not a healthy person. They should be aiming to exercise and reduce body mass.

Of course, but there are plenty of people that won't realize that without seeing a doctor.