Fedora Workstation 33 successfully switched over from EXT4 to using Btrfs as its default file-system. Now with Fedora 34 due out in the spring we are seeing Fedora beginning to make use of more features offered by Btrfs…

Source: Phoronix – Fedora Workstation 34 Looking To Employ Btrfs Zstd Transparent Compression By Default