Matt,
From your post above, "quirk...situations that are based on a preponderance of luck" and "When luck becomes the dominant factor."
Are you saying that quirk=luck? That's not how I view quirk at all, and I suspect it's not how a number of folks hereon view quirk. As indicated by the definition below, quirk is an idiosyncracy, an odd or peculiar trait. If you look at some of the posts on the Black Mesa thread, you'll see folks gushing about situations and shots they faced where the course or green design made the player do something OTHER than just aim it at the hole and hit it straight. See, eg, the posts about the backboard on #7 green and the sideboard on the front of #10 green. To get the correct result, the player had to recognize the idiosyncratic or quirky feature and execute the correct shot to get the correct result. Nothing lucky about it at all, just recognition and proper course management. I think that's why many hereon like quirk. It's not straightforward design, it makes you think, and skill and smarts--not luck--are required.
From the dictionary: quirk. a : an abrupt twist or curve b : a peculiar trait : IDIOSYNCRASY