Hi Steve !
I am not a Dorico user, nor have I used Finale. I have been using Notion for about ten years and have been really happy with it's playback and mixing capabilities without having to go through a DAW for editing. The only drawback is its limitation to what libraries can be played back using notation only. I can playback with some good libraries like East West Gold Orchestra, BBC Orchestra and its solo strings, as well Cinematic Studio Strings and solo strings.
That being said, I may check out Dorico just to investigate how they approach the playback editing, midi export etc. Maybe we could compare notes?
Thanks for sharing.
Mark