i wouldn’t as care much too if I’m only interested in less competitive specialties. But there is a bias for MD over DO among residency program directors. The MD letters will give you an upper hand during the matching process for residency. For example, it will help you get into more competitive specialties (ortho,derm/ophtho/neurosurg/etc.) or more highly desirable (urban) residencies.
However, that is not to say that DOs cannot match into a highly competitive specialty in a desirable location. They just have to work a lot harder for it.