That's always been my concern when looking at Orleans. Why can't Microsoft just be up front about the status of these things, so that people don't pick them for greenfield projects?
What are the actual "live" platforms for running Orleans? I don't want to deal with running clusters and nodes, the closer to 'serverless Orleans' the better for me (Functions Durable Entities etc is not the same thing)
I think if you look at the consistent development history, you can use that as an indicator. Internal teams host it on Kubernetes (Linux), Service Fabric (Windows), and other places. The "Orleans at Microsoft" talk from August covers where teams are hosting it and how they're using it: https://youtu.be/KhgYlvGLv9c