DNF, the Fedora package manager, is going to be significantly rewritten; it
seems it is truly “development not finished” for now.
“We’ve managed to drop a lot of redundant code across the whole DNF stack
in the past years, but we have reached a point when it’s nearly
impossible to consolidate the code any further without breaking the
API/ABI. Especially with PackageKit being dead, we can’t move with
the old ‘libhif’ API in libdnf, because making any bigger changes to
PackageKit is clearly out of scope.“

Source: LWN.net – Announcing start of DNF 5 development