project to sketch

I'm not sure when it is appropriate to project to sketch. It seems that every time I create a new sketch on an existing surface that I cannot snap to a point on that surface unless I first project to sketch. Is that expected, or am I missing something? Also, is there a way to go back and turn...

This one activates a 2d Sketch, Projects to Sketch a face as a reference figure with Association Maintained and then closes the dialog, select a face before using it. The Sleep lines are just to slow it down to see what's happening, remove all the Sleep lines and it will run instantly. +a...