I can give you mine. I was working with a Raspberry Pi 3, and using a USB SSD. It's a USB2 link, so a bit choked, and I figured, hey, filesystem compression can help here, btrfs supports it, great! And it helped - you could get "real world" disk reads a good bit faster than the USB2 bus speed.
Until one day, I rebooted, and it didn't come back up. Analysis on another system was that the btrfs filesystem was just... toast. I've no idea what happened, I found some stuff that said "Oh, uh... don't use btrfs over USB, it kinda breaks in some cases...", the recovery tools couldn't even decide that the filesystem was a btrfs filesystem, and, nope.
I put data on the filesystem, I expect it to come back. btrfs broke that guarantee with a Pi full of data (nothing too important, they're just scratch systems and light desktops), so... I now stick to the boring things like ext4 that have been exceedingly well proven. Is it the best filesystem out there in terms of features? Certainly not. Am I pretty darn sure that I'm not going to trip some edge case and totally scramble the filesystem? Yes, and that's what I care about.
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