I'm not talking about configuration structs, I'm talking about actual, constructed dependencies being passed around in large sacks, sorry, structs.

And you don't have to propagate every parameter up to main because a) not all things are made in it, b) things that are being made in it are already being made in it and so, are already being passed down. This passing down stops down somewhere, which is where you reinstate it, not all the way up in main.