> Because why should I have to click to get focus?
The click not only focuses but is also passed on to whatever you clicked on, so it's like it was already focused.
> Less of an issue on a tiling window manager, but sometimes I really want to be able to type in a window without bringing it to the foreground.
I don't understand that. You have to somehow indicate to the system what it is you want to type on.
> Also, selecting text should copy and middle click should paste. No one can convince me these things are bad or unnecessary.
I'm 100% with you on that. Although saying "selecting text should copy" makes it sound like it's being copied when selecting, when it's actually copied when pasting.