How dare they promise Airplay 2 "soon" at WWDC 2017 and still not have it released a year later. Oh and it actually was present for a while.
Not sure what the aim of this major point release release is really considering everything significant has been dropped. It should be in a minor point release IMO (i.e. 11.2.6).
You seem to be ignoring the rest of the changelog. There are more than enough changes to justify a x.1 update.