Only through dialogue do you know the scene's intention. Dialogue is everything. It doesn't have to be theatrical. It's important because it makes you think about motive. Writing cinematically means you don't give a shit about motive.
Dialogue is people structuring people.
For me, dialogue is paramount. It's easier to write and to read back to see if it makes sense. Write dialogue and then come back and see what it means. Structure is useless because it doesn't come from character. It's imposed from outside.