Writing in an academic community is largely a process of finding and structuring reasons that can provide these grounds. It also provides a way of envisioning the potential major parts of an essay and the connections among them. Form is generated by reasoning. One need not rely on model forms to find the shape of one's essay. Style is like logic in that clarity and effectiveness depend not only on what is said but also on what assumptions about the reader are appealed to in the saying.
Style is a matter of appropriateness.
Revising is rethinking.