If you read the thread Ideas that can make collecting much simpler what you actually proposed was having your name next to the submitted card. Whereas what’s proposed here is the ability to send an offer to the submitter without knowing who they are.
Every person that raised an issue specifically raised it about having the username next to the cert. For me, I don’t always want it to just be open and known when I send in a card that it’s my card. In contrast, if someone wants to send me an offer without knowing who I am and I can ignore with no consequence, I’d consider it and think it’s a useful service.