This is very disappointing. I'm kind of amazed that they think this is a good business decision when there are massive numbers of paying customers with mountains of python code using boto3. I imagine much of that code uses the resource interfaces since they're easier to use.

This isn't some fringe feature they're deprecating; the official documentation uses these interfaces in its examples; they're literally telling you that's the correct way to use the library and then the next moment they're telling you it's not.