I think that it's really hard to anticipate the effect of any balance update. Gw playtest team is a lot smaller than thousands of people worldwide playing the game.
I do appreciate that they make small points adjustments, and then wait and see how that works and then see if further change is needed, rather than just doing huge sweeping changes in one go which can cause things to swing too far in the other direction.
I do appreciate trying to bring up the weaker armies (this update actually addresses that, which I was really surprised by). But, there is always the need to wait for the book to be brought entirely up to the same level. 2/3 of my armies have no eta on when they are being updated, so I feel you on that.
Chaos demons are very playable, but not as mono demons.
Tau, gsc, and guard are all languishing the most, and 2/3 of those are getting new books fairly quickly.
I just want everyone to have crusade rules so my club can play a sweet crusade campaign and everyone gets the same out of it.