For years I've been using Solidworks and I've never understood this.
Example: When creating a specific hole pattern, 2 taps and 2 dowels that form a rectangle pattern, I like to create the rectangle for construction geometry. (See Attached Pic). This makes it easier selecting the opposite points for the taps or dowels in the opposite corners later.
But when you are in point mode creation for holes, the system gives you an error saying it can't apply it to an existing point ( a line endpoint). But you can put it beside it and then add a relation. To me this is broken and should be addressed. Also, there is no way to suppress or turn off sketch points in the hole wizard for different hole configurations.