This is a suggestion, but it’s also a request for help (because as sometimes happens, a feature I think it’s missing from Dorico it’s actually there, but hidden to my eyes).
I don’t think divisi works well playback wise, because when you make a divisi, what it does is that it keeps the first staff as the main instrument and then adds (or shares) the second one.
Instead, it should create two new instances in the play mode. One for Divisi 1 and another for Divisi 2. Instances different from the tutti, of course. Also, this would allow to do well the Solo/Gli Altri divisi. This way also would translate better to the DAW.
Divisi works pretty good engraving wise, but it’s not that good in when you have to play it. Unless I’m missing something, which is possible.
May I say that divisi in Dorico is a game changer for me and I really LOVE IT.