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Same here: I use a rolling release and btrfs. Personally I really enjoy btrfs's snapshot feature. Most of the time when I need backups it's not because of a hardware failure but because of a fat finger mistake where I rm'ed a file I need. Periodic snapshots completely solved that problem for me.

(Of course, backing up to another disk is absolutely still needed, but you probably need it less than you think.)

Depends on the rolling release; some distros specifically provide a kernel package that is still rolling, but is also always the latest version compatible with ZFS.

> I don't want to deal with keeping ZFS up to date

That's what DKMS is for, which most distros use for ZFS. Install and forget.

I think the larger issue is that openzfs doesn't move in sync with the kernel so you have to check https://raw.githubusercontent.com/openzfs/zfs/master/META to make sure you can actually upgrade each time. On a rolling distro this is a pretty common breakage AFAIK. It's not the end of the world, but it is annoying.