Joining curves problem

I split a curve at it’s midpoint, rotated copies of one side 10 and -10 degrees. When I try to join the three separate curves I get a problem as you can see here.

2015-10-13_13-53-09.mp4 (6.8 MB)

You can only join exactly two curves at a single endpoint.
If we allowed that, you would end up with nonmanifold surface edges that cause other problems including surfaces that will not Boolean. It’s technically possible to create nonmanifold surface edges in Rhino but we go to great lengths to avoid them.

Thanks, I’m glad it was a real limitation and not a false move on my part.