In order to protect vulnerable citizens, it's imperative that counselors-in-training be supervised by licensed professionals that fall under the auspices of the Board of Counseling.  Certainly, exposure to other branches of the mental health field is beneficial to the Resident in Counseling but those other licensees (social work, psychology, medical doctors, nurses, etd) report to their own respective Boards.  If the Board of Counseling is to provide oversight in the process of licensing of Counselors, it needs to have authority over supervisors of those Counselors.  The day may come when all the mental health specialties merge under one Board but that's not the state of things now.