Would they leave it up to family members and friends to make a choice whether to associate or not with adulterers, apostate and so on?
By doing so the GB would relieve themselves of any blame for what's going on in the organization for all the broken marriages and rejectiion of sons,daughters and friends..
We've seen the same with the appointments of elders, they have nothing to do with it anymore, leave it up to the elders and CO to qualify brothers.