I've come up with different levels of being outdated:
1. Your Mac model has been replaced with a newer model.
2. Some (but not all) current Macs at lower levels than yours (if applicable) beat yours on at least 1 item on the tech specs page.
3. Some (but not all) current Macs at lower levels than yours (if applicable) beat yours on ALL items on the tech specs page.
4. ALL current Macs, regardless of price level, beat yours on ALL items on the tech specs page.