I don’t find this that surprising. I have wekord for architects for years, and they request these kinds of changes all the time. I noticed right away that all of the windows had been replaced with perfectly exposed views. A dead giveaway for this is that the floors are brighter than the windows. A reflection is never brighter than the light source it is reflecting. It is very difficult to balance the exposure between the bright window and the room in-camera, therefore it is a commonly requested change. I only have a problem with it when the exterior that is put in is not the true exterior of the building. To drop in beautiful landscaping when there is really a brick wall outside the window is an outright lie, and unethical, in my opinion. That is, if the picture is being used to sell the property. If you are just making a pretty picture for the architect’s portfolio, then I guess it is okay. They would probably be better off if they had a cache of 20 or so skies which they could rotate randomly, and people would be far less likely to notice the trick. I have a collection of skies I use for this purpose. I also keep fire images for the same reason. Gas fireplaces do not produce a dramatic flame, so dropping in a raging fire is a fairly common request.