There are parts of the filesystem that will still need to be written - most of /var
, /proc
, etc. The good news is that those are well known, and save for some exceptions could be tmpfs mounts.
Also, most modern filesystems have journaling and are resilient to sudden powerdown events, especially if you're not writing a lot.
Left (uncooked) is directly on the baking sheet, right (cooked) is on aluminum foil.
No one, not even someone insane enough to make a meat baby, would go through the effort of assembling it on a bare sheet and then adding the foil under it.