I've seen smart glass demoed at a home show 25 years ago. I thought it was way cool, until they quoted the price. It's no surprise it hasn't gotten any traction since. Oh, it also consumed electric power when in dark mode, as much as a light bulb. It's not a passive system.
Window blinds, louvers, eyebrows, shades, etc., all work fine and are cheap.
BTW, when I lived in Phoenix in the 1970s, people would tape aluminum foil or newspapers on the windows to cut the heat intake. The newspapers would block most of the solar heat, but would let the light through.
Here in Seattle I made some reflective panels I can just stick on the windows when we have a heat wave. Plenty of light still gets in.