Sentence examples for what has changed since from inspiring English sources

The phrase "what has changed since" is grammatically correct and can be used in written English.
It is typically used to ask about changes that have occurred in a specific time period or situation. For example: "What has changed since we last saw each other?" "What has changed since the policy was implemented?" "What has changed since the last time I visited this city?" "What has changed since the company was bought by a new owner?".