Currently, Wikidata is explicitly excluded from hashtag monitoring in the tool because the volume of data is orders of magnitude higher than from all other projects combined. The overall rate for all other projects is on the order of dozens of hashtag uses per hour - for Wikidata this is more like thousands. If we want to avoid the data overload issues we had with the old hashtags tool we need to consider how best to proceed.
Tracking Wikidata edits has value - many campaigns involve Wikidata contributions. However, there are many automated or semi-automated means by which editors can make edits which include a hashtag edit summary. From a cursory glance it appears that quickstatements is the biggest culprit. We could exclude it specifically, but that might be confusing.