Because it's more difficult than parse "5" and "7", especially when you need to parse not only numeral IDs. "More difficult" always means "more bugs" and "more vulnerabilities".
There is no single reason for this complication. The ONLY motivation author had - less knowledge about API endpoints on the client. But simultaneously it means more knowledge about the fields where links are stored, so it doesn't save nothing.
There is no single reason for this complication. The ONLY motivation author had - less knowledge about API endpoints on the client. But simultaneously it means more knowledge about the fields where links are stored, so it doesn't save nothing.