Excellent! (... for "closed curves!)
No closed curves here! )
Edit / Join must be done for collapse mutual points...(not made yet here)

I see michael, your explanation is very helpful, when scaling two vertices in both directions it works as a collapse command (in case it is the same shape, if they are two different shapes you have to use the join command at the end) and when using the move command works like a target weld.

Remember that the point thus created is a corner point! (edit/join or flat/flat)

- Zooen