Debating this here on a user to user only forum won't get you anything. Apple's not going to change their position on this, just like cellular providers don't track ownership by serial number either.
I'm constantly amazed by how many people don't do the simplest of things. And that's to keep important logon information written down somewhere safe for future reference. I have a locked notebook, stored where only I know where to find, that has all my ID's and Passwords written down. I store my receipts for all my electronics physically and electronically. The electronic records are backed up to a cloud service, I can access from any computer anywhere.
It's up to us, the customer to keep important documents and while I understand your frustration, I'll say it again, it's not Apple's fault you didn't.