Also a Mac user here. I expected a release 6th of september and I want to play now. I'm disappointed and a bit frustrated with the lack of communication, but I don't really get the rest.
For example why would "this uncertainty has cast doubt on the game's quality and playability." For me it is the opposite. If they delay the release it is a sign that they are not 100 % happy with the game and want to put in more work to make it as good as it can be. I definitely prefer that over rushing it out with bugs and performance problems that wound make it unplayable. Delays is a sign of high standards when it comes to quality and playability.

I'm fine with delays as long as they are justified and communicated properly. Especially if the delay is because the developers thinks the game is not good enough and wants to push a bit more to get it there. I guess this is the first experience with the new Metal API and the Game porting toolkit for Mac which makes it hard the get an accurate timeline.

So definitely quality over rushing the release for me, but I would really appreciate some official communication regarding this.

Also, has the Mac release really been postponed repeatedly? The only thing I have heard was early september, and that is still not impossible.