Hi Michael,
What's happening next is Analytics will release the new Analytics Reporting API in October, 2018.
The Analytics Reporting API V2 was previewed in an Adobe Summit 2018 lab session. It is the same reporting API that the Analysis Workspace UI is built on. It will be available via the Adobe I/O Console and Gateway and will support the following:
* oAuth authentication
* Automatic data-center routing
* No queueing/polling - true REST request/response
* Swagger interface and specification
Regarding the 1.4 API documentation in Github: GitHub - AdobeDocs/analytics-1.4-apis: Documentation and helpful resources for calling the Analytics...
Please let us know if you think there is something missing from the 1.4 documentation in Github. We removed the documentation on oAuth through the 1.4 API gateway as it's shortly to become deprecated (but still supported for those callers currently calling 1.4 APIs - don't want anyone to panic that their code will start breaking in October) with the release of the V2 APIs under Adobe I/O. Other than the removal of the 1.4 oAuth documentation, all other 1.4 documentation should be in the Github repository.
Note that there is also a working Swagger interface and specification, Swagger UI, which can be used either directly or with a variety of publicly-available API tools to provide the same functionality as the API Explorer. It didn't make sense for Adobe to continue supporting and maintaining a custom API Explorer tool when there are so many readily-available alternatives.
We hope you enjoy using the new version of the Analytics Reporting API when it's officially released in a few months!
Thanks,
Brian