(Not being a major contributor here, I'm not 100% sure what the community deems is on-topic. But here is my stab at answering this. Please vote accordingly.)
What is on topic here is primarily how to write, not what to write. Thus a plot making sense or not is not generally on topic. If a plot makes sense, but the way it's written doesn't convey that sense, maybe we can help you fix it. We can provide tips on the kinds of things you might add or subtract to make the writing convey the idea.
What we don't generally do is evaluate the idea. To some degree that will happen as a by-product, but it isn't the primary goal and isn't on-topic on its own.
For some plot-related questions, the World Building stack might be appropriate, but they have their own scope so they are not a dumping ground for any plot-related questions we might encounter.