EWS (Exchange Web Services) to Microsoft Graph Migration Guide Series

When will the full Graph API be available?  EWS was a complete API when published. Sure, there were some updates but it was fully functional.  We have watched Graph add bits and pieces and remove (depreciated) functionality in the last three years. We had to stop and redo development because of this. It is hard to develop when the Graph API is not fully defined. How long will graph be around? What ever happened to publishing a complete API like EWS or VSTO?  I have asked about Public Folders in Graph for three years and I still do not have an answer.  We do not feel comfortable that Graph will even be complete and that it will be around in five years. Microsoft needs to publish an end of life for Graph.  Canceling an API and not having a replacement upends a VARs ability to continue with developing using Microsoft technologies.