I mean, it sounds both tempting and terrifying at the same time, but even assuming it’s a good idea, how to reproduce my data, then? Not just the data per se, but all these volatile stuff in /var and $XDG_{CONFIG,DATA,STATE}_HOME as well. I like the idea of being able to (re)produce the entire system from a tiny “seed”, but my system is still not the same without those parts, as it will behave slightly differently. So I still have to backup all my data, haven’t I?
Also, using different partitions might be less fragile, but also much less convenient in terms of free space management, especially when you only have a single medium-sized SSD. So I just use a single rootfs (with subvolumes instead of partitions) for the system and all kind of data.
How do you know it was btrfs, are you living in my walls?!
Well, jokes aside, it was a power outage. In my defense, I’ve survived dozens of power outages while using btrfs with almost no negative consequences!