In class, a point made about subject quality: a sample is good if it is appropriate to the question being asked. You cannot legitimately criticize a study for “only using college students” (or whatever) unless there is a articulable reason to think that the sample is inappropriate to the particular inquiry. And often there is such a reason, but frequently the objection is formulaic and in service of some other agenda.
Analogously for game design: a system is good if it is appropriate to an audience (or can be misused, misunderstood, or corrupted in a way that is appropriate to an audience). The second case is “hacking” in both the traditional using for a purpose other than originally intended and the RPG modifying slightly senses.
Maybe this is obvious? In any case I found the comparison useful to think about, given how often “good design” is conceptualized as some sort of independent quality.
Aside: you may have noticed the relative dearth of posts lately. This corresponded with the beginning of grad school, which seems to be somewhat time intensive. Who would have thought? I do not intend to disappear completely, but expect the frequency to remain lowered.