I think this is a pretty reasonable answer...summed up, you could have all the steps but you were missing two things: 1) the theoretical knowledge of how the d

I think this is a pretty reasonable answer...summed up, you could have all the steps but you were missing two things: 1) the theoretical knowledge of how the devices worked, which enabled the creation of steps in the process that resulted in fully working devices 2) the ability do do each step repeatably and precisely and reliably.