Cinema's most important aspect is the aesthetics.
It's the logical axiom of cinema, the first and therefore absolute truth to the medium. Meaning that, in a rough manner, sounds and storyline coherence are secondary to the will of aesthetic.
Following the systematic distribution of categories within cinema, it's logical to affirm that the diegetic structure of the mimesis is what matters the most, as it's closely vinculated to the roots of the medium itself.