*That last comment makes no sense to me. They even used the term brainstorming session, which to me says discussion. I see nothing about admissions officers only, did you just make that up? Very misleading to imply that is what they were doing, it is clearly open to all, with a special call out to people that actually had to do what the OP is asking about. Of course it makes sense to ask admissions officers or similar people to contribute, what’s wrong with that? If you thought they wanted only admissions people, current or past, to answer then why did you? Is that your background?
And as far as the Penn ED, that is a very specific case, this is opened up to asking about all highly selective schools.*