Futurology

I'm aware of how roundabouts work thanks.

Cars don't stop in roundabouts. They're made for cars. Drivers don't pay enough attention to pedestrians when in motion. They never have.

Traffic lights stop the 2 ton killing machines. Roundabouts do not.

Roundabouts are strictly worse. Traffic lights are better because they inconvenience drivers more and there's nothing more important than inconveniencing drivers.