The lack of nudity would also potentially have resulted in a scene as odd as Traynor & Fem Shep's clothed make out session in the shower. You'd have two characters laying together on the grass in a private moment, after having slept together, having put full armor back on.
Not necessarily.
The scene could have been with them back at Skyhold with them in bed under a sheet (it's not like the Inqisitor's bed is used for anything anyway)
Or the conversation could have been later, as they were dressing.
Or the conversation could have taken place later, at another point where Cassandra and the Inquisitor were sharing a private (clothed) moment.
The only way to have done that scene differently and not reduce the characters to weirdos who spoon in plate armor, would be to use different camera angles and position the characters differently where the nudity is implied but not actually shown.
I can live with that. They did that in ME1 anyway.