If knowledgeable users were made aware of questions that they can answer, we might see a greater number of questions answered.
For example, I'm sure there is someone knowledgeable here who can answer my question regarding Catholicism in England, but may not have seen or been made aware of my post.
Maybe this is unjustiable to implement, just an idea.
As a heads up we don't allow directly pinging an expert in a thread to be like "Hey can you answer this." It tends to feel a bit rude and puts people on the spot. We do send alerts to our various flairs when we see something in their area, but life as it is means it really depends on their time.
But if you want to browse the panel for question ideas or see if there's anyone who might be able to tackle it in the first place, you can check out the panel list, and some users maintain a profile with more detail.