In our company Vol 1 it talks about overboost/overspeed protection. On the RB211 we dont have FADEC but we do have an EEC to stop overboost overspeed. So we can push the thrust levers fully forward and not trash the engine, although we have no EGT protection. Without EECs we have no overboost/overspeed protection and therefore we can trash the engine.
This relates to the RB211E4 on the B757