Their is one useful performance tweak, the RAID-Zx expansion speedup. It’s covered here;
However, @Protopia your point about defaults is also valid. The average HexOS user can wait until the feature / fix is implemented into OpenZFS, then into TrueNAS and finally into HexOS.
If a HexOS user wants “cutting edge” features and fixes, why are they using either HexOS or TrueNAS? Neither support such out of the box.