one one the most important problem is that musicmusic is very active and publishes quite a lot of versions of his UI columns component. Changing the installer may be annoying both for peter and musicmusic.
Not saying that a new version should be created for each update of UI columns.. if it was already the case, we would be in 5.9.7

.
UI columns is developed apart from the core of fb2k itself.. It should remain independant. Even if it is more complicated for new users..