Search is a hard problem, it really is. Let me show this by using an example of a food chain that wants to add Drupal as their homepage of the whole chain. Of course, like many other organisations they do not only have Drupal running but also a subset of other web frameworks open and closed source systems.
Drupal Search has a great ecosystem of modules to integrate with technologies such as Solr. However, it needs more vision and direction to grow and be a great platform where other developers feel comfortable with and are able to make the right decisions. Also