Hey, I've been trying to wrap my brain around the same issue and I think the issue is that not all direct entry masters prepare you to be a NP. With the changes in the required standard for nursing education, many schools have direct entry programs that don't prepare you to think like an NP but more like a clinical nurse leader/specialist. . . the programs are easier to complie, take less time for students to complete and still abide by the new requirements. For example, positions like nurse educator and CRNA are specialized positions that require similar course work but don't require one to have a broad scope in terms of clinical hours and populations cared for. This is great because not everyone wants to be an NP but if you would want to eventually sit for NP boards you'd need to get a certificate of advance study or a DNP in the field you'd want the NP degree in. For example, Columbia just changed their direct entry BSN/MSN program to a MSN/DNP or PhD program. This now ensures one would have the highest level of education expected to date, and not have to reapply for the hire degree. At Hopkins it looks like you'd have to apply for advance study before sitting for NP boards.
With that said, programs where you specialize for your MSN degree ( you'll study in-depth on a subject or population; women's health, family, adult-gerontology, pediatrics, etc) will still prepare you and allow you to sit for NP boards after graduation. The issue is more so that when looking for a job what will employers want? But I have known people to do either path and still land jobs in similar positions.
If anything I stated is wrong, correct me :) This is everything I figured out from my research other the past few months. Also if I need to elaborate on anything, just ask. Hope this helps!