The question no one ever asked.

[ChevyRacefan]

ok: bare with me.
I love and hate tinted side and rear glass. it is a royal pain at night.
Now, having said that, my childhood eye glasses tinted dark when out in the sun, but was clear glass (plastic) when no sunlight .
Why has this not become used an automotive glass either oem or aftermarket.
It seem ( my opinion) to be the best of both worlds, clear glass at night, but tinted when the sun is blindingly bright.
Why isn't this a thing with replacement glass?