With the SXA 9.3 two new search features have been introduced. First, we have the aggregated search filter. This component allows you to create dynamic filters sets, which will automatically adapt to the content available in the search results. Then we have the facet summary, which shows the facets applied and allows you to remove them individually or all at once.
I just noticed that Sitecore has greatly improved their search on SDN. You can now search through SDN, the shared source and Sitecore blogs.You even can filter your results by sdn sections, collections and datatypes. Only minor is that I can’t find a list of blogs they included in the search, so for that I will use my own search.