Good review. One thing mentioned is that the author was able to remove Kitematic amongst other things. Kitematic is a GUI for Docker. There is currently no replacement for it.
I was under the assumption that Kitematic wouldn't work with the beta but low and behold it does. I'm not sure what it will do if you have the old Docker toolbox installed at the same time however.
I had an older version of Docker installed as well as the beta, so when I installed Kitematic nothing worked correctly until I reverted everything.