FWIW, I worked on the integration with calendar and maps - the GP comment is exactly right, it was due to privacy concerns. The terms of service for Workspace say that user data can never be used for anything not related to Workspace, so moving any user data from Workspace to another service has to be done very carefully.
In the example of this integration, allowing it to open in the sidebar was okay because it was a user action, and there is some data anonymization that happens (I don't recall the details, this was a few years ago).
But we couldn't share a list of your appointments with maps ahead of time to allow them to generate the view you describe, because there wasn't a way that guaranteed that the data wouldn't be associated back with the original user.
In the example of this integration, allowing it to open in the sidebar was okay because it was a user action, and there is some data anonymization that happens (I don't recall the details, this was a few years ago).
But we couldn't share a list of your appointments with maps ahead of time to allow them to generate the view you describe, because there wasn't a way that guaranteed that the data wouldn't be associated back with the original user.