Comment by tptacek

This is like saying that DNSSEC is doing well in terms of "installations" because European zones tend to be signed by default by their registrars (which is security theater). What matters isn't the absolute number of zones signed; it's how widely used those zones are. Overwhelmingly, Internet email is sent without DANE consultation. By the numbers, MTA-STS (which is a marginal protocol) is wildly more important than DANE.