Hi.  I'm the mappers who worked on the intersections that CurlingMan pointed out.

Anybody who has seen my mapping knows I am a massive fan of smooth curves....where they're appropriate.

The problem with the curves you made in the intersection is that they make some routes look beautiful at the cost of others looking unnecessarily bad.  When traffic flows in both directions, the convention is to compromise and use straight lines instead.

But it's more than just an aesthetic choice.

The navigational routers often weigh how sharp a turn is in their best route calculations and may incorrectly rule out the best route if the angles they meet at are too sharp. 

Also when an intersection point is too far off from the actual GPS position it'll have more issues with where to snap the vehicle to the road.  This is mainly a problem with very wide intersections.

Those extra constraints is what I was trying to address when reworking them.