This is in part cultural. In UK, much of Asia, and continental Europe, students specialize earlier. On average, most degree programs (and especially professio

This is in part cultural. In UK, much of Asia, and continental Europe, students specialize earlier. On average, most degree programs (and especially professional degrees like MD) take longer in the US system. Not saying this is necessarily how it should be, but it is how things are. There are a few combined UG-med programs in the US, but not as many as one might think. So perhaps there just isn't demand for them. Or they're too selective.