I don't think the no risk order in that situation was that bad an idea. The two Scharhorsts could have undoubtedly have taken out Ramillies. However if Ramillies had landed even one lucky shot and reduced the speed of even one of the Scharhorsts then the Germans would have faced loosing 50% of their available cap ships. I think with hindsight for Germany to use or frankly even possess capital ships was a mistake. The resourses that it took to build and man Bismark could have been used to turn dozens of merchant ships into small raiders. True none would last all that long but they would still pin down real warships and if you loose an armed merchantman big deal. On the subject of the Yamatos at Guadalcanal I don't hold myself out as any expert but what I do know do know is that many of the clashes were in battleship terms at knife fight range. The side that shoots first will come out best since at such short range no practical scale of armour will stop a shell and since more shells in a salvo will hit a ship will very quickly take a fatal level of damage.