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Replaced my door with vertical slabs to see what you mean and yeah the bit of weird lighting would be completely fixed by just dimming the outside light to light level 2 or something. Would also make more sense anyway with what Emeal said about doors historically not being airtight, so the reduced light level would represent the bit of light leaking through

I mean, a slab can be well lit on the top side and not lit at all on the underside (if the underside is dark) so I don't see how this would be an issue with doors

It would just make more sense if doors without any holes for light to pass through (so solid doors, 3-tall doors, gates, etc) blocked all light when they were closed. It feels weird to see all the light from outside leaking into my starter house with no windows when I replace my crude door and breaks the immersion a bit. I should be forced to get light sources! The same should probably hold true for trapdoors in case mods add solid trapdoors.