In Major Promotion Shift, All Soldiers Will Serve as a Corporal Before Moving to Sergeant

Be
Know
Do

Understanding what the role of an NCO before assuming the aforementioned role. Good call

Not so sure about this. I had some specialist that were fantastic at their tehnical jobs, but could not lead a thristy dog to water.
Of course, IMO, the Army did a bad move by eliminating the Specialist ratings. I worked with a Sp/7 in Vietnam, that was a computer system analyst-programmer. He could make those old computers sing. He was not Army at all though. I knew a number of Sp/6's through my career that were the same.
I would think in today's high-tech military, there would be an even greater need for a geek squad and a nerd platoon.

I think this has good potential. I have never been an NCO, but I think the great ones probably mentor their subordinates. This should be mandatory. The military is a school. We learn how to kill or support the killers. When we boil it down, learning how to kill is the essence of the military. Everything else wraps around it. Tactics, leadership, fighting spirit, technical knowledge, team work, training, and the love we have for each other. We are institutional killers who fight the nation's wars.