DS9 had the big stumbling block of effectively needing a time jump to catch up to the ongoing TNG/Titan stories. I honestly think it was a mistake to drag out the whole Ascendants storyline in the way that it happened, with DS9 ending up being 'caught up' by way of Typhon Pact novels (Rough Beasts, Plagues of Night, Raise the Dawn), The Fall, and THEN putting the conclusion to the Ascendants thing in Sacraments of Fire/Ascendance, which split the 2377/2386 narratives between them.
That 'decade of wheel spinning' on this one storyline crippled the line in my opinion, and, since we didn't get to see the characters moving on and being replaced as time went on, the result was that they basically 'joined' the story as part of an infodump, where there was no real sense of who they are for the audience, because they appeared effectively spontaneously and yet, with all the other things that need to be cleaned up and dealt with, they don't really get to shine - Ro is basically the central figure of DS9 right now, and, while I believe there's still enough distinction between her and Kira, I understand where people are coming from in saying they are basically filling the same role in the story. The rest of the crew is still struggling to establish themselves, because their involvement has really been mostly in terms of moving the plot along through the Event stories taking place around them - PoN/RtD, The Fall...
Really, one of DS9's strengths in my opinion was the revolving writers, who would focus on this element or another, letting certain things take a backseat as they gave more focus to other areas - Avatar was establishing the new status quo, giving a major Kira plot point and a new arc for her, but the next book, Abyss, was a Bashir focus story. I feel like it would do DS9 good to get voices other than just DRG involved - we've seen that with Una McCormack and Jeffery Lang, but neither of them had the opportunity to really play with any of the new characters.
I mean, Wheeler Stinson finally got some characterization in Ascendance, after having appeared in at least two books before that. At the moment, I really couldn't tell you who holds what position on the crew anymore. I REALLY want to see the 'main' storyline of the DS9 novels at the moment be resolved so that we can just get a chance to have a more proper 'pilot' for these characters, to be better introduced to them.
This has kinda been a similar issue I've had with TNG - Elfiki's been part of the crew for years now, and I really can't think of something of a defining character moment for her. Same with Faur and Smrhova - I had to consult Memory Beta to see who the crew actually was. Chen and Dygan have at least managed to make an impact on me, but the rest of the crew who've joined in the post-Destiny novels are really blank slates from my perspective.
In addition to getting even one slot of 24th century novels set during the run of their respective shows, I'd honestly appreciate some timeline backtracking, just to give these characters a more prominent role in between the Events.