Checks.
The rate at which the new competitive categories promote will likely go down because the AF still only needs/is authorized X number of new O-4 or O-5s per year. In the Current system, officers compete for every authorized line number. In the new system they will only compete for slots allocated to their competitive category (sts). Because smaller, support type competitive categories will have guaranteed line numbers, the result will be a lower overall selection rate (%) for the ops category. However, the goodness is that each competitive category can define what it values in its officers. Instead of competing with sitting Sq/CCs from the MSG the lead hundreds of Airmen, the ops category can place higher emphasis on things like deployments, WIC grads, etc.
I personally think it’s a fair trade off because the goobers and queep monsters in Ops will more easily standout amongst the purely ops records.