I’ve started using BTRFS on my laptop with OpenSUSE and on my Steam Deck. It does two things for me, which I’m interested in. On OpenSUSE it does a snapshot before every system update. So if anything goes wrong I can easily roll back.
On the Steam Deck I love the deduplication. It’s really great for a ton of Windows games that all need their own little “Windows” environment which amounts to a GB or two per game. With BTRFS I only use that space once.