There are so few monster sets which are worth using in PvE for DDs. The only ones which see any use are Selene and Balorgh with Zaan and Maw of the Infernal as honourable mention. Selene and Maw are base game and both Balorgh and Zaan were released in 2018. There has been times where other monster sets were briefly used like Domihaus and Kjalnar, but neither has been good in years.
So even if count Kjalnar (released in 2019) as the last good DD monster set, it has been six years since it was released!
If we look at monster sets before Kjalnar, there was actually some competition:
Balorgh
Domihaus
Grothdarr
Ilambris
Maw of the Infernal
Nerien'eth
Selene
Stormfist
Valkyn Skoria
Velidreth
Zaan
All of these sets were pretty good and usable in at least some stage of the game. Even half decent monster sets after Kjalnar:
*crickets*
It's not that there hasn't been DD monster sets, they are just all extremely bad.
(Note, Black Gem Monstrosity has some potential if it wasn't held back by the requirement to use Soul Magic abilities)
Newer support monster sets have seen some use though, notably Nazaray, Archdruid Devyric and Ozezan.
Could we please have actually good DD monster sets again?