Imaginative, discursive, persuasive and reflective writing are four types of writing, and each one promises its reader something different. Strong writers blend them on purpose, lending a scene to an argument or an argument to a reflection. Switch the type of writing, then add a blend, and watch which sentences keep the promise.
Each type of writing makes its reader a promise: blending types is a choice you control when the borrowed move serves that promise, and drafting with feedback is how you keep it.