At Physics StackExchange, we discuss almost all types of physics topics. Some get more attention and some get less, but it depends upon various things, including our site policy. Our policy has been the same for each topic for many years, which I feel is not right for topics which are not popular topics among the current members of the site.
Our site aims to be a platform for all types of physics topics, whether they belong to any particular field. Consider the example of fluid mechanics, which is one of the less active topics on site. Why I am saying this is because fluid mechanics is a topic which is less popular among GR and quantum lovers. They straight away flag the post to either homework type or transfer it to another website, which I feel is not right!
What we can do is ease our homework policy for this topic, allowing some useful answers by some experienced users, creating a separate room for the topics which are less active, and resolving new inexperienced user problems there, to allow all kinds of thought on that particular topic.
For a limited time, we can do this, like two weeks. If beyond that, we can't improve it, then we will be back to our old policy. If this policy works, we can apply it to other physics topics too, and, like math.stackexchange, we soon we will achieve a site which is for all classes of physics lovers. I hope you will share your thoughts on it!
If you have anything better than this, please suggest.