I see your point, but although highly relevant, this update has been very much under focus for months.
There was also “the big testing thread” in our forum.
I didn’t get a chance to participate, but in my opinion a look at how things were going had to be taken every now and then.
For example, there was some talk about it at the moment.
or here:
Everything was done, very well in my opinion, and without being able to know when Arch would have released KDE6 from testing to extra, so in my opinion it would have been difficult to manage a precise communication in terms of timing and details (as things were fixed as testing progressed).