[ptasci67]

I have always found that the most difficult aspect of any application is nearly always the integration points. Hiring only specialists would probably only make that more pronounced.

That isn't to say this isn't a necessary evil sometimes. Security and mobile development are two simple examples that come to mind of dedicated specialists that many organizations have.

When it comes to generic development, it is beneficial for one person/team to own the entire stack because often the domain specific problems are where the complexity arises, not in the frontend/backend split.