score:4
The answer to the assumptions you make in your question, as hypothesis, is no: Were navies built around the use, and defense, of carriers from the start of the war?
About some weapons being more important than others in a pre-war state, I suggest to everyone to look at today's discussions about weapons. The main speech is "everything is important and we don't sacrifize anything, no no no". But in reality, obvious important weapons are made superior to some others, sometimes accurately, sometimes no. The point here is that tactical guidelines, also known as doctrine, lacks the capability, especially in technical armies such as air force or navies, to provide clear elements on what is important and what is important but secondary.
This is general consideration. Now, answering to your question for navies in ww2 and how they considered carriers: