This isn’t being ignored, and work is well underway to resolve these issues. The Chromecast/Displays fixes aren’t trivial, so if someone guaranteed it would be in the “next release” they should’ve talked to me first 
We had a number of performance and stability improvements tested and ready to go for yesterday’s release, and we wouldn’t want to hold those all up as the Displays fixes come together.
But rest assured we’ll ship these changes just as soon as they’re ready-- we know people are waiting on this and we’re on it.