evon3 RobotBen Back with answers/suggestions from the Containers team:
1. They don't have a current date to share for NFS client in Windows container support. They definitely encourage you to give them direct, specific feature requests at https://github.com/microsoft/Windows-Containers/issues so they can add it to their roadmap Windows Container Roadmap (github.com)
Some advice: I suggest telling them about how much of your business they are losing here, rather than just stating you want it, like most customers do. Nothing moves a PM's planning more than specific instance count or potential revenue missed, when they are balancing a gigantic pool of requests with a much smaller set of dates and coding resources.
2. I hear you on the SMB container story (I own SMB, as you probably know). Because of how containers work, there are a lot of pieces missing from the usual client capabilities. I don't see any open github requests or roadmap items for symlink support, I definitely suggest filing one. SMB supports symlinks, hardlinks, junction points, reparse points, etc. so this is a specific limitation of the container SMb client; it may have started off intentionally as a security boundary, now is the time to start telling them you need that functionality so we can explore it. Same advice as above.