I think the OP's point is which hotels are classifying "junior suites" (ie, a single large room) as the entry-level "suite" for the DSU. GP's definition of a "suite" for the DSU is a "one-beroom suite", which seems to be a contradiction when receiving a single large room.

We personally are more interested in overall space and ease of use rather than complete separation, but I can see that guests travelling with children or inviting someone into the suite to talk business or otherwise looking for the added privacy might prefer 2 separate rooms, no matter how small, to a single large room.