The ability to use the same pattern for several things could really speed up things, for example assembly of bolts into a bolt pattern.
Right now one first has to create a hole pattern and then a separate bolt pattern. Fairly easy to do with a circular pattern, but it becomes tedious when trying that with a hole pattern as created with te hole tool.
It would be nice to re-use an already existing pattern even for a circular bolt pattern even if you just want to change the number of bolts.
For a hole patetrn, when adding new locations another screw has to be copy-pasted adn then assembled instaed of hving an instance appear based on a pattern. Real situations where a screw joins components that same pattern currently has to be generated three times. Once for the through holes, onece for the component the screws are threaded into and once for the screws.
Here is a screencast that hopefully helps explaining it.
Some of what I have explained above is called a Sketch based pattern in SW and can be really powerful.