As someone who's lived in Zurich, here's the main advantage of streetcars vs buses: They get their own reserved space in the middle of the road. That makes them

As someone who's lived in Zurich, here's the main advantage of streetcars vs buses: They get their own reserved space in the middle of the road. That makes them very reliable and on-time like trains (assuming good planning / operations). That's why they're still popular in places with good service, and new ones are getting built.