What is stopping them from implementing light clipping, esp. through walls/floors/ceilings?
This is an old issue that I noticed with windows with light. I am not sure if it is going to be solved, since we waited 7 years to get Alinor doors or windows.
I get this problem a lot, and try to do the builds with this issue in mind. Also, while the lightsource is static - the sun - the light from the window will not adjust accordingly as you rotate it, so you can have opposing windows shedding light in a hallway, even if one window is against the external light source. Sometimes you want this effect, sometimes you don't.
Another issue which I would like addressed, is to be able to have at least a few light intensity settings, available only in the housing editor, so you could make a light source stronger or weaker. Some lanterns are very bright, while others are quite dim, for example. So, from the editor, set the brightness higher or lower, while outside the editor, the light source has just the on/off toggle. This will help a lot, and save housing slots for many builds!