It's a delicate balance.
I still contend that if the story demands style elements which go against convention and the so-called "rules," the writer should go for…
It's a delicate balance. When you write a spec script, you don't want the so-called "rules" to constrain your creativity if the story calls you to go against convention. However, script readers, often young and relatively untrained, may tend to "ding" a script which goes against convention.
I still contend that if the story demands style elements which go against convention and the so-called "rules," the writer should go for it. If it's a great story, it should get through Hollywood's "gatekeepers," even if they may not have much in the way of understanding Story.