Top 30 demand side here: I don't want to answer the same boring questions about my dept from the 25+ candidates we're interviewing. I don't want to spend the last 90 seconds of your interview summarizing my research, or hearing about my colleagues' research.
Conversation abilities do matter, but the fly-out is much more useful for that, and asking a question in the last minute or two is not going to save you if the previous 28 minutes revealed you have none.
In short, just thank the interviewers and say you'll ask questions in the fly-out if you are invited for one. (This advice may not hold for schools that may be unsure whether you are really interested in them. In that case, showing that you've done a bit of background research on them might be a good idea.)