Put another way, writing the dots helps you and others play the thing, and to interpret your ideas, so if you want to write it without ever hitting the obvious tonic, you'd have to keep changing the Key sigs, making it harder to read/play, you also change the obvious time sigs to make it harder as well, didn't Prokofiev do that sort of thing? I think you know what I mean, but generally there's a real desire by our ears to have that foundation of the tonic, which acts as that big heavy base like the base you put you garden umbrella in.