I relate to your usage scenario, and my requirements are similar, and so are my frustrations with older filesystems: little or placebo protections against silent data corruption, lack of CoW semantics, pain of deduplication.

But on the other hand, over the years, I've heard so much FUD -- or underwhelming rumours that may-or-may-not be FUD -- about both ZFS and btrfs that have made me very reluctant to jump ship, and instead lean on an extensive suite of homemade processes and procedures that badly try to replicate subsets of features I'd expect a modern filesystem to provide. This is likely a Bad Idea, but my trust model right now can better stomach me losing data due to my bug, than someone else's.

I think what I'd like to see is widespread deployments, deployments-by-default, and better, persistent press and/or marketing surrounding *ZFS or brtfs, such that I wouldn't feel like an early adopter when using these filesystems. I'm actually glad Apple secretly wrote a filesystem with some of the same ideas, and deployed it to production on millions of (users') devices in the wild, because it raises the profile of modern filesystems and increases the likelihood that comparable alternatives will see more attention.