It's important to realize that opinion-based does not mean off-topic. There are plenty of questions where the subject matter is very much within the scope of this site, but they are not a good fit for the Stack Exchange format. Questions, like asking for the name of a design pattern, are in this category. There are plenty of on-topic questions about architectural and design patterns. However, asking us to name it tends to yield many people sharing their opinion on a possible name rather than a canonical name, if one exists. This type of question then turns into a popularity contest rather than one where answers can be judged based on their correctness.