If I had to describe a rule, I’d describe it in terms of the voluntariness of the feature, the background likelihood that people discriminate against those with this feature (not just the individual likelihood that the community-former is being exclusive for discriminatory reasons), and the difficulty/intrusiveness of hiding the feature should one want to do so.
What about something like IQ? It satisfies all of your criteria for being maximally protected, but also seems relevant to many tasks. Plus somehow I don’t think you object to the existence on MENSA.
What about something like IQ? It satisfies all of your criteria for being maximally protected, but also seems relevant to many tasks. Plus somehow I don’t think you object to the existence on MENSA.