Anything’s possible. But, they try to make that hard. The system always keeps 2 versions around, the newest one and the previous one, so if you screw up the newest one you can always boot into the previous one. And Bazzite, at least, uses BTRFS which uses copy-on-write, so it’s much harder to corrupt the filesystem. I think the /boot partition is still ext4 though, so it’s possible that if you time it just right you could theoretically mess up your boot partition. Then you’d need to use a rescue USB drive to fix it.
Anything’s possible. But, they try to make that hard. The system always keeps 2 versions around, the newest one and the previous one, so if you screw up the newest one you can always boot into the previous one. And Bazzite, at least, uses BTRFS which uses copy-on-write, so it’s much harder to corrupt the filesystem. I think the /boot partition is still ext4 though, so it’s possible that if you time it just right you could theoretically mess up your boot partition. Then you’d need to use a rescue USB drive to fix it.