To be fair, though, Eukrasian Dosis is no more Dosis than Dia, Afflatus Solace, Glare IV, is Glare, Biolysis is Broil, or Combust is Malefic.
Nor does Eukrasian Dosis even change the number of skills you need on your bar relative to the other 30s-duration DoTs. You're still using another key to then replace an GCD of the functionally identical attack, up to once per 30s (20s, in Afflatus's case; thrice per 120s in G4's case).
The difference is just that you hit the filler attack's button once more per DoT; that's it.