Well written, but author is at the risk of tripping over Poe's Law, especially if readers don't read to the bottom.

Author's point is that their modest proposal (and its sibling, introducing intentional delays in resolving the deprecated API pieces) is a bad idea. Instead, author suggests that making the API change at all is begging the question "Who does this API serve?" It is, perhaps, okay actually if the old system never gets deprecated.