I agree completely with the original thought. I also think that the conscious search for one's own musical personality, especially in terms of cultivated difference or worse, iconoclasm, is a mistake. Better to simply carry on creating music which, at least to you, possess beauty and transporting power, and is a true abstract manifestation of your psyche in as profound a way as possible, with no regard for whether its properties might be considered old or new. Let any emergent personality form of its own accord, it might take decades but it will sooner or later, and might be something surprising, entirely different from what you had imagined. Learning to be yourself cannot be forced, it just seems to happen. Mind you, I am just an amateur, outsider player, unconcerned with comparisons or posterity, but the same mechanism probably operates in higher musical and social modes.
The ingredient and recipe analogy is also an amusing one to make, we know what tastes and sounds good, so we make dishes/works with the sounds we like.Who would think to throw in feces into a meal just to create a new recipe? In a way this is what I think many composers did - instead of challenging themselves to forge new tastes with pre-existing tried and tested tasty ingredients - they incorporated the aural equivalent of fecal matter in their music!