You’re thinking about the selective view in a way that focuses on people who have the incentive to make these kinds of requests.
Sorry, but I think you’re somewhat misunderstanding me. The incentive to make such requests is one part of the selective view. But it’s not the only part. “What will the student body be like if we [ do / don’t ] adopt a policy of granting such accommodations” is a question that can coherently be asked (and which has a non-trivial answer) even if we totally set aside questions of incentives!
Sorry, but I think you’re somewhat misunderstanding me. The incentive to make such requests is one part of the selective view. But it’s not the only part. “What will the student body be like if we [ do / don’t ] adopt a policy of granting such accommodations” is a question that can coherently be asked (and which has a non-trivial answer) even if we totally set aside questions of incentives!