Comment by ryao

To give an answer that nobody else has given, ZFS is great for storing Steam games. Set recordsize=1M and compression=zstd and you can often store about 33% more games in the same space.

A friend uses ZFS to store his Steam games on a couple of hard drives. He gave ZFS a SSD to use as L2ARC. ZFS automatically caches the games he likes to run on the SSD so that they load quickly. If he changes which games he likes to run, ZFS will automatically adapt to cache those on the SSD instead.