I had a lot more questions concerning how the interface relates to the world but I came down to these two but there's a lot of follow up questions that I'll not bore you with.
1. If "all culture, past and present, came to be filtered through a computer", is it merely the relationship or the interface between the user and the computer that filters it or is it literally the computer the "medium" that ultimately filters it like languages/words argued by Whorf and Derrida?
2. The paper argues that "the interface imposes its own logic on media"; however, can't we say that the people such as computer programmers and artist who makes the logic and makes operations as the 'cut and paste' operation is imposing their own logics and 'models of the world' to the user?
I thought some of the arguments and debate Manovich talked about relates a lot with just art in general such as the subject of concept-interface and concept-form he talked about. Interesting paper.