No need to justify that you had a different take on it!Sorry to hear you didn't care for this story as much. I liked the DTI stories overall (in fact, the DTI series is the only place I could see maybe some reconciling between the current relaunch novels and Picard---though it would have to be more interesting than just the parallel timelines idea--I mean, that much is obvious, but DTI could be a vehicle to bring the two together at some point). Anyway, off track a bit.
But part of it is just differing tastes. I like expository stories so I don't mind taking time to go into exposition. Granted, expository stories can get bogged down, but I didn't really feel that way in this case.
Part of it I think is the DTI novels by their nature require exposition. Because you are dealing with things that have happened and will happen you have to explain what's going on to the reader to make sense. Otherwise the reader will be left scratching their head wondering what the point was or what's going on.
To be clear, I'm not saying there's anything wrong with your take on it. I just came at it from a different viewpoint.
I do agree the time lock was an interesting concept, but that part did 'slow down' for me (pardon the pun). It seemed to take some of the gas out of the room, though because time outside was proceeding 'normally' it did add some danger. They couldn't wait forever. And at times it was a bit difficult going back and forth in the story to slow time and normal time. All the DTI novels required the reader to pay close attention to what was going on or you could get lost--which is where the exposition probably comes in and why it's sort of a requirement for DTI, whereas other novels can afford to sacrifice some exposition. In this case it's pretty much needed to keep you on track.
Exposition is one of the trickiest parts of sf, I reckon. The key is deploy it at the exact right moment; Ann Leckie has a good piece on it here, and I think she's very good at it in practice too. Yes, she has infodumps in a sense, but because she delays them until the exact moment you need them, they don't feel disruptive to your immersion. The exposition comes thick and fast in DTI sometimes, and some of it comes too early, and some of it you don't need at all.