Dash chain can be used to do other things than Darksend transactions. For example transparent transactions. That counts as use as well, no?
Can you also use Dash for transparent transactions? That is a very good feature of dash. Dash can be used both ways.
Problem there is because privacy is not enforced by default at the protocol level in Dash you can essentially black list addresses and remove fungibility of certain "coins".
Privacy should be on by default and the user should consent to transparency of their own choosing. Not the other way around or any other combination.