Its to prevent issues with new or occasional sellers running the risk of only getting negative feedback and this then having an impact on their account.
Automated positive feedback will be added to your feedback profile 7 days after tracking confirms successful delivery, provided the following criteria are met:
- Tracking shows the item was delivered on time
- The buyer hasn’t left feedback yet
- The buyer hasn't reported an issue or opened a return on their order
I don't see the issue. The buyer can still choose to overwrite that feedback if they wish. But if an item has been tracked as delivered, the feedback left is accurate and it improves the look of your feedback level.