I think what the OP is trying to say is that officer promotions put them in positions of leadership i.e. company level, battalion level, far sooner than enlisted promotions do. For example, I'm a SSG with almost 12 years TIS, that's more TIS than my current company commander has, however, my 1SG has over 20yrs TIS.
I think this is partially due to the number of enlisted Soldiers and NCOs, we are a far larger demographic than the officer ranks. Simply put, there are just too many of us to promote much faster than we currently are, especially with the reduction in force. It's less expensive for a Soldier to reach their RCP than it is to promote them and train them, and getting promoted is becoming harder and harder, especially for Soldiers looking to make SGT and SSG. You also have to take into account, a brand new 2LT is going to be in charge of a platoon sized element and will have a SFC or even a SSG showing him the ropes. I say that to say, officers need experienced leadership, although they out rank their NCOs they still need to take direction from their NCOs and support their NCOs recommendations because that NCOs years of experience are paramount to leading Soldiers and accomplishing the mission.
Also the scope of responsibility of NCOs compared the that of officers is different. NCOs train the force, enforce the standards, and are the boots on the ground when it comes to shaping today's Sodliers for the future to include grooming our officers into better leaders. Any officer worth their salt has likely had an outstanding NCO that molded and advised them throughout their career. In regards to promotions, I don't worry much about officer promotions, that's a different food chain and frankly I've always felt officers were a bit disconnected with the Soldiers; where as an NCO, I have daily contact with my Soldiers and a direct influence on their day to day lives and careers and I enjoy setting my Soldiers (to include my officers) up for success. Just my two cents.