Issue 2 you mention is an issue for me. If I am in Safari or Xcode and click that green blob, I get a full screen window. Now, what if I want to use Calculator to calculate something related to the webpage or code I am viewing? I use cmd-space to open Spotlight and type "calculator" and press Enter. Now, I get a calculator but on an entirely different desktop because fullscreen apps and non-fullscreen apps cannot share the same desktop space. It's STUPID.

I know you can hold down alt or whatever to make it behave like it used to, but I wish they'd put an option in to make it behave like it used to as the DEFAULT.