For most of our cruise on the Edge, we just left the separator doors open and the 'balcony' part of the room, when added to the rest of the room felt like one continuous, larger space. At least to us it did. When we did have the window down, while it did not feel exactly like a true balcony, it did feel close enough to us....especially when we closed the separator behind us and made the balcony its own space. The only thing that bothered us a little is that if one person in the cabin was asleep, there was really no way to 'sneak out' to the balcony quietly as the window and the separators make noise. Minor impact though.
We have an upcoming cruise on the Beyond and we booked the same type cabin. It worked for us.