One of the problems with the elder system is that unless they end up fornicating a pioneer sister , or leaving the Org after discovering the Truth About the Truth , it is basically a position for life. I've sat in long boring elders meetings where elders refused appointments of elders & MS and frankly , they themselves would never be appointed if they applied the same criteria to themselves. Its like the Peter Principle in real life.
After I left JWs and got involved in some voluntary and community organisations , I noted very similar set ups in most committees of any type. 25% of people are pretty competent , 50% just are padding , maybe OK if you just threw them a bone to work on and 25% are useless and/or obstructive.