We have a lot of formats that should be deprecated -- e.g. Cocoa. But, on the flip side, there are a number of formats that we don't support that are very popular and related to the TEI--for instance, Page XML, ALTO, IIIF, geojson, hocr. These conversions exist, but are not part of the standard Stylesheets (and thus, arguably, a bit less findable for the TEI community).
So this is a bit of a broader question, but: Should we be expanding the Stylesheets? Or, if not, should we be thinking of ways to promote/link out to these tools?