We have https://discovery.wmflabs.org/external/#traffic_by_engine where we show the breakdown of pageviews by major search engine. This gives us information that is currently not available in the pageviews data cube in D/T/S where search engine traffic is categorized as having referer_class external (search engine)
So… question 1 is whether we still want to keep track of that when it's not particularly actionable for us. If anything it's more of a dashboard for search engines who can essentially use it to check their share of the market relative to others.
If we do want to keep tracking it, question 2 is whether we want to have additional granularity and what those dimensions should be.