"Need is mother of Invention"-- is it ?

Why to we keep trying to understand things all the time? Trying to justify evrything on the name of curiousity, and trying to theorise evrything on the name of logic and science. Why not to leave things like a black box from where we can get a desired output when we give it an input. Lets talk about it for a while. QM: Questioning me, JM: Justifying me QM: So whats the meaning in finding the reason and logic behind evrything? JM: When we underststand systems and we know how they work, we can modify them and find new systems with more desired output and for a given input. QM: But we can also understand systems as a black box, we know whats the output for a given input, and keep changing the input and standerise the input-output respons and hence use the system for the desired output. Its easier isnt it ? JM: Quite correct, well that might work for a while. But understanding systems gives us insight of the process and we can change the system at basic levels and make them more efficient ...