Pathfinder operations generate wrong point types

First of all I'm very impressed with how certain Pathfinder issue got solved in the web version, because the result is cool. When uniting this 

on the desktop you usually get a result like this:

But there is still some room for improvement, because Illustrator on the web makes corner points where there should be smooth points (see video https://youtu.be/q0yddoS5v_8   - video is unlisted)

If that can be solved, can we then have this kind of result in the desktop version as well? It would be a huge improvement.