Full height window is not full height El Capitan I have the issue that my windows are not really full height in OS X. I'm new to OS X so I don't know if this is new.

Here is an example image:



Watch the few bottom pixels, the background just shows there, because the window ends. This is obviously not the full screen mode for windows like in a separate space but this is the maximize with the option key.

I am on an Early 2013 MacBook Pro Retina if that is relevant. I'm using the smallest scaling so 1650x1050

Edit: Changing the scaling didn't fix the problem.
Apple designs the screens to leave a gap between the top window and the menu bar (especially noticeable with a dark menu bar and a bright background image) and also maintains a gap between the physical bottom of the screen and the window.

If I were to guess, it's to preserve shadows and "depth" of the interface and they made a conscious decision to implement windowing this way.

You might have to file some bug reports and gather use cases for how this is bad to get them to reverse this decision. It's hard to unsee once you notice it, but I don't think it's just a bug in their code.