At the risk of appearing picky, KDE Plasma Workspaces is a desktop
environment as is Unity. KDE cannot run on Unity or vice versa.

Canonical is making a statement with this decision. It is only one
developer, but it is saying that they believe in Unity and only Unity. They
do not want any distractions.

Ubuntu critics who think that Ubuntu is going back can give up. Canonical
is trying to separate Ubuntu from other distributions, including their own.