DT members and HFSX members do or at least have collaborated in the past.
As we have 3d fov and moving dogfight servers, which have migrated from HFSX to DT works (among others).
My understanding, as from other post here and the DT credits, is some of the DT members work or have worked the HSFX project, and/or vise versa. (not sure about SAS members), but no matter. If you read the credits from the DT current and previous patches, you'll see who all contributed, which are several "modders" so to speak in the credits.
And one benefit from this is the NG thing is irrelevant.
Another Point is, I (or you) have the ability to contribute and not just complain with a very high quality mod, to DT's standards, that is (He177 or B-24, case in point), and it too has the possibility of making it into an official patch, which would be just really cool to see.
(excluding ng stuff, but, as stated, that is already taking care of
)