A couple nits to pick: BTRFS doesn’t use/need journaling because of its CoW nature - data on the disk is always correct because it doesn’t write data back over the same block it came from. Only once data is written successfully will the pointer be moved to the newly-written block. Also, instantaneous copies from BTRFS are actually due to reflinking instead of CoW (XFS can also do reflinking despite not being CoW, and ZFS didn’t have this feature until OpenZFS 2.2 which just released).
I agree with the ZFS bit and I’m firmly in the BTRFS/ZFS > Ext4/XFS/etc camp unless you have a specific performance usecase. The ability to scrub checksums of data is so invaluable in my opinion, not to mention all the other killer features. People have been running Ext4 systems for decades pretending that if Ext4 does not see the bitrot, the bitrot does not exist. (then BTRFS picks up a bad checksum and people scold it for being a bad filesystem)