Going through the question [Why do washing machines have windows?](https://ux.stackexchange.com/q/50259) I couldn't find anything opinion-based about it. The question describes a general observation and is seeking an explanation for it. Sure OP has provided some of his opinion's in it, but they are they are irrelevant to the core question.

Based on what was it determined that the question was primarily opinion-based?

Should it be reopened?