BTRFS snapshots are relatively cheap. I have about 10 or 20 or so on my systems. Snapper manages that for me.
Also I’d say that you only want to roll back for catastrophic errors like the system not booting. If you discover after 8 upgrades that a package that was updated on the first upgrade has some critical bug you wouldn’t roll back everything else to fix the issue. You would just downgrade that single package to a known good version.