One result I have observed after working with armies that only draw their officers from the ranks is the marginalization of their NCO corps. Those officers ruled with an iron fist, and the NCOs were those that did not "make it" to officer. I like how our recruits can choose either path as their aspirations and aptitudes take them. The result is experienced NCOs with junior officers.
I was on a liaison visit to the Italian Army when it still had the draft. Their regiment had roughly 75 to 100 professional officers and senior NCOs and took in a draft of a thousand or so (9 batteries to the regiment) and put them through a screening. The top 50 or so were selected for officer training and were made 2nd Lts and the next 75 or so selected as Snr NCOs, sent on a course and made sergeants. The rest filled out all the other jobs.
In a recent interview of someone involved in training the ANA in 2005, he mentioned that he discussed with an Afghan general the problem that Afghans had delegating anything, especially to NCOs. In their system as well there is an intake of individuals followed by a selection process assigning individuals to officer, NCO and various trades streams. He was advised of two things. Firstly that delegating anything is considered a weakness in Afghan culture and secondly that the concept of NCO in their culture was equated as an "officer failure".
Our officer/OR structure may have its heritage in a very rigid class structure but seems to have matured into something practical. The three things I would like to see are: elimination of the university requirement for officers; a separate career stream for WOs (separating it from the Sgt/Sgt Major NCO stream so as to facilitate technical specialization); and attendance for ORs and officers on a common DP1 course (followed perhaps by six months in a unit in the ranks) before officers learn the leadership aspects of their jobs.
Why does a Doctor or Lawyer need to be an officer?
In some armies they don't. As a LegO my primary client was usually one or two ranks higher than me thus I had no power over them other than as an advisor and, since I belonged to the JAG CoC, they had no power over me in the performance of my legal duties (see
QR&O 4.081)
While I don't usually want to wind
@dapaterson up on the topic of lawyers, he might want to comment on the pleasure he's had working with CAF legal officers and the DoJ civilian lawyers.

I doubt that you could get one out on an operation but maybe a WO type of specialty would do if the pay scales could be made to work.
