I just got into Skyhold a few hours gametime ago, but that's after 90 hours trying to complete everything I could to that point (won't do that again btw), so I'm doing a lot of Skyhold stuff, and I just had my first kind of date scene with Josephine. I think it's good so far. This is the first I've heard of there not being a love scene with her though. That really sucks, honestly, unless there's a very good, clear character reason for it. She's one of only two options for straight male or lesbian Inquisitors, so if it really does leave things 'ambiguous', that's really not fair. It absolutely does detract from her romance as an option if that's the case. But personally, I'm enjoying her character, and I'm going to stick with her for my first playthrough. I'm kind of dreading whatever ambiguity I'm going to be stuck with later though. I agree they need a scene in dlc if that's true about the vanilla game, because it is important.
I'm going to eventually play them both (along with Sera, Solas, and probably Iron Bull with female Quizzies), but Cass seems like very much the same character from her movie, if that helps. My Quizzie flirted with all the women at first, and then when he didn't continue that with Cass later on, her dopey cutesiness came through in how she walked away, so she's not all the hard front she puts up. She's likable under the shell. I just never really found her all that interesting though. I just don't like that type. Like I said though, my game is still early days.