I can't help but notice that you were unable to address the package manager issues raised by my post.
Compiling software from source (kdesvn-build) is not easy. This happens to be the route I chose through the KDE4 release cycle, and can confidently say that it is not something most end users would do.
Running beta software in a VM (kde4daily) is not convenient. Do you copy all the files you want to work on to the VM? Do you set up a shared directory? Ugh. It also doesn't help spot problems like what we saw with KDE4 and the Nvidia binary driver.
Finally, binary snapshot packages have the problems detailed in my previous post.