Enable updating Site Pages via Graph API
The current beta version of the Graph API for SharePoint Sites, specifically the Page objects, supports GET (read), POST (create), and DELETE (delete) operations, but does not appear to have any support for PUT (update) of an existing Page.
This means that in order to make an update to a page via API, the only option is to GET the current page, update as needed in our application, DELETE the current page, and then POST to create a completely new page (losing all history, original creation date, etc.) with the same name/title... which also results in a new object ID that we have to store.
It would be a much better and more logical developer experience if there was an API method to update existing Pages the way there is for most other objects in the SharePoint portion of the Graph API.
I've confirmed this current limitation with Aaron Miao of Microsoft SharePoint Developer Support (via Premier Support) and was instructed to raise the feature request here.