So after working with macOS Sierra i have to say one thing that drives me nuts is the “purgeable” space. Why not just have this memory go back to being free space ? Of course after doing a lot of googling you find out there is really no way to make this “free” space. That is unless you write large files of crap from the terminal. This just frustrates me and i think its one of those things that if Steve Jobs was still alive would of never been allowed.