I have a merged storage container for screws and iron plates. I expected, when I connected a belt to the output, that the output would be mixed too. Only the iron plates come out.
Probably, when plates run out, the screws will come out too, but I intend not to run out of plates, I just wanted the storage container to act as a buffer between my constructors and assemblers. This is kind of illogical. Or maybe just in my opinion.