I just posted about Dirac in the AU/VST plugins thread here: Does Roon support/will support VST plugins?
HQ player means adding another new product to Roon, which if you don’t want its features is a bit overkill for Room Correction.
It also means you can’t use Dirac, and would rule out RoonSpeakers.
I’m sure there are other ways to shoe-horn Dirac in, including hardware boxes, but generally they would rule out RoonSpeakers too.
It would be so much nicer to have plugin options in Roon, that way the user has a lot of flexibility, whether they use HQ player or not. 