ReFS still is not supported for use as a boot (C:) drive, but it's used extensively in enterprise environments for VHD storage and as a backup target.
Snapshotting and merging is much faster because of "Fast Cloning." It also has something called "integrity streams" which can be used to tell if data has been corrupted.
I don't understand this all at a deep level, but it seems promising.
Somewhere, somehow, this is going to break something lol