The Meaning of Life, the Universe, and Everything.
Idea: What if you could make Glass out of Soul Sand.
It could maybe be fully transparent but not let light through (similar to tinted glass). Or maybe completely dark, but still let light through. Or maybe it functions like a Transition lense, changing with the the time of day.
(It could also be used with my proposed Bottle 'o Enchanting Upgrade)
I can partially support this, as the idea is not bad in any sense. I've read a post on Reddit that had a similar idea, where glass would simply glow if powered by redstone, or allow mobs/players to never be seen through the glass, but everything else is seen normally.