[stickfigure]

I do not understand what distinction you're making. In the world of DI, you still have typed constructors and factory methods. It's not like Guice turns Java into Ruby. The only difference is that you don't have to chain together constructor boilerplate - in fact, the static types determine the injections.

Do you object to passing interfaces vs concrete types? That is a wholly orthogonal concern; you make the choice to extract interfaces with or without DI.

Maybe you have an example?